2009-12-21 03:26:15 +01:00
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DROP TABLE IF EXISTS t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11;
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DROP DATABASE IF EXISTS world;
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2010-08-31 18:34:21 +02:00
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set @save_optimizer_switch=@@optimizer_switch;
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set @@optimizer_switch='semijoin_with_cache=on';
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set @@optimizer_switch='outer_join_with_cache=on';
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2009-12-21 03:26:15 +01:00
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set names utf8;
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CREATE DATABASE world;
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use world;
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CREATE TABLE Country (
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Code char(3) NOT NULL default '',
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Name char(52) NOT NULL default '',
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SurfaceArea float(10,2) NOT NULL default '0.00',
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Population int(11) NOT NULL default '0',
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Capital int(11) default NULL
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);
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CREATE TABLE City (
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ID int(11) NOT NULL,
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Name char(35) NOT NULL default '',
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Country char(3) NOT NULL default '',
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Population int(11) NOT NULL default '0'
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);
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CREATE TABLE CountryLanguage (
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Country char(3) NOT NULL default '',
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Language char(30) NOT NULL default '',
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Percentage float(3,1) NOT NULL default '0.0'
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);
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SELECT COUNT(*) FROM Country;
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COUNT(*)
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239
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SELECT COUNT(*) FROM City;
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COUNT(*)
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4079
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SELECT COUNT(*) FROM CountryLanguage;
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COUNT(*)
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984
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show variables like 'join_buffer_size';
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Variable_name Value
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join_buffer_size 131072
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show variables like 'join_cache_level';
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Variable_name Value
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join_cache_level 1
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EXPLAIN
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SELECT City.Name, Country.Name FROM City,Country
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WHERE City.Country=Country.Code AND
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Country.Name LIKE 'L%' AND City.Population > 100000;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
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1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer
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SELECT City.Name, Country.Name FROM City,Country
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WHERE City.Country=Country.Code AND
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Country.Name LIKE 'L%' AND City.Population > 100000;
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Name Name
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Vientiane Laos
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Riga Latvia
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Daugavpils Latvia
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Maseru Lesotho
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Beirut Lebanon
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Tripoli Lebanon
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Monrovia Liberia
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Tripoli Libyan Arab Jamahiriya
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Bengasi Libyan Arab Jamahiriya
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Misrata Libyan Arab Jamahiriya
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Vilnius Lithuania
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Kaunas Lithuania
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Klaipeda Lithuania
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?iauliai Lithuania
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Panevezys Lithuania
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EXPLAIN
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SELECT City.Name, Country.Name, CountryLanguage.Language
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FROM City,Country,CountryLanguage
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WHERE City.Country=Country.Code AND
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CountryLanguage.Country=Country.Code AND
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City.Name LIKE 'L%' AND Country.Population > 3000000 AND
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CountryLanguage.Percentage > 50;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
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1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer
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1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer
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SELECT City.Name, Country.Name, CountryLanguage.Language
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FROM City,Country,CountryLanguage
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WHERE City.Country=Country.Code AND
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CountryLanguage.Country=Country.Code AND
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City.Name LIKE 'L%' AND Country.Population > 3000000 AND
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CountryLanguage.Percentage > 50;
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Name Name Language
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Leiden Netherlands Dutch
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La Matanza Argentina Spanish
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Lomas de Zamora Argentina Spanish
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La Plata Argentina Spanish
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Lanús Argentina Spanish
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Las Heras Argentina Spanish
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La Rioja Argentina Spanish
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Liège Belgium Dutch
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La Paz Bolivia Spanish
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Londrina Brazil Portuguese
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Limeira Brazil Portuguese
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Lages Brazil Portuguese
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Luziânia Brazil Portuguese
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Lauro de Freitas Brazil Portuguese
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Linhares Brazil Portuguese
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London United Kingdom English
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Liverpool United Kingdom English
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Leeds United Kingdom English
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Leicester United Kingdom English
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Luton United Kingdom English
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Los Angeles Chile Spanish
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La Serena Chile Spanish
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La Romana Dominican Republic Spanish
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Loja Ecuador Spanish
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Luxor Egypt Arabic
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Las Palmas de Gran Canaria Spain Spanish
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L´Hospitalet de Llobregat Spain Spanish
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Leganés Spain Spanish
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León Spain Spanish
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Logroño Spain Spanish
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Lleida (Lérida) Spain Spanish
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Le-Cap-Haïtien Haiti Haiti Creole
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La Ceiba Honduras Spanish
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Livorno Italy Italian
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Latina Italy Italian
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Lecce Italy Italian
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La Spezia Italy Italian
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Linz Austria German
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London Canada English
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Laval Canada English
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Longueuil Canada English
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Lanzhou China Chinese
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Luoyang China Chinese
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Liuzhou China Chinese
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Liaoyang China Chinese
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Liupanshui China Chinese
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Liaoyuan China Chinese
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Lianyungang China Chinese
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Leshan China Chinese
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Linyi China Chinese
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Luzhou China Chinese
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Laiwu China Chinese
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Liaocheng China Chinese
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Laizhou China Chinese
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Linfen China Chinese
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Liangcheng China Chinese
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Longkou China Chinese
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Langfang China Chinese
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Liu´an China Chinese
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Longjing China Chinese
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Lengshuijiang China Chinese
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Laiyang China Chinese
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Longyan China Chinese
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Linhe China Chinese
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Leiyang China Chinese
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Loudi China Chinese
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Luohe China Chinese
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Linqing China Chinese
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Laohekou China Chinese
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Linchuan China Chinese
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Lhasa China Chinese
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Lianyuan China Chinese
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Liyang China Chinese
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Liling China Chinese
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Linhai China Chinese
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Larisa Greece Greek
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La Habana Cuba Spanish
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Lilongwe Malawi Chichewa
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León Mexico Spanish
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La Paz Mexico Spanish
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La Paz Mexico Spanish
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Lázaro Cárdenas Mexico Spanish
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Lagos de Moreno Mexico Spanish
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Lerdo Mexico Spanish
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Los Cabos Mexico Spanish
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Lerma Mexico Spanish
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Las Margaritas Mexico Spanish
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Lashio (Lasho) Myanmar Burmese
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Lalitapur Nepal Nepali
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León Nicaragua Spanish
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Lambaré Paraguay Spanish
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Lima Peru Spanish
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Lisboa Portugal Portuguese
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Lódz Poland Polish
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Lublin Poland Polish
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Legnica Poland Polish
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Lyon France French
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Le Havre France French
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Lille France French
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Le Mans France French
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Limoges France French
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Linköping Sweden Swedish
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Lund Sweden Swedish
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Leipzig Germany German
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Lübeck Germany German
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Ludwigshafen am Rhein Germany German
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Leverkusen Germany German
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Lünen Germany German
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Lahti Finland Finnish
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Lausanne Switzerland German
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Latakia Syria Arabic
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Luchou Taiwan Min
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Lungtan Taiwan Min
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Liberec Czech Republic Czech
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Lviv Ukraine Ukrainian
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Lugansk Ukraine Ukrainian
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Lutsk Ukraine Ukrainian
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Lysyt?ansk Ukraine Ukrainian
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Lower Hutt New Zealand English
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Lida Belarus Belorussian
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Los Teques Venezuela Spanish
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Lipetsk Russian Federation Russian
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Ljubertsy Russian Federation Russian
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Leninsk-Kuznetski Russian Federation Russian
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Long Xuyen Vietnam Vietnamese
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Los Angeles United States English
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Las Vegas United States English
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Long Beach United States English
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Lexington-Fayette United States English
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Louisville United States English
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Lincoln United States English
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Lubbock United States English
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Little Rock United States English
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Laredo United States English
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Lakewood United States English
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Lansing United States English
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Lancaster United States English
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Lafayette United States English
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Lowell United States English
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Livonia United States English
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set join_cache_level=2;
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show variables like 'join_cache_level';
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Variable_name Value
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join_cache_level 2
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EXPLAIN
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SELECT City.Name, Country.Name FROM City,Country
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WHERE City.Country=Country.Code AND
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Country.Name LIKE 'L%' AND City.Population > 100000;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
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1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer
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SELECT City.Name, Country.Name FROM City,Country
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WHERE City.Country=Country.Code AND
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Country.Name LIKE 'L%' AND City.Population > 100000;
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Name Name
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Vientiane Laos
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Riga Latvia
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Daugavpils Latvia
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Maseru Lesotho
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Beirut Lebanon
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Tripoli Lebanon
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Monrovia Liberia
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Tripoli Libyan Arab Jamahiriya
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Bengasi Libyan Arab Jamahiriya
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Misrata Libyan Arab Jamahiriya
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Vilnius Lithuania
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Kaunas Lithuania
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Klaipeda Lithuania
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?iauliai Lithuania
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Panevezys Lithuania
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EXPLAIN
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SELECT City.Name, Country.Name, CountryLanguage.Language
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FROM City,Country,CountryLanguage
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WHERE City.Country=Country.Code AND
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CountryLanguage.Country=Country.Code AND
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City.Name LIKE 'L%' AND Country.Population > 3000000 AND
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CountryLanguage.Percentage > 50;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
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1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer
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1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer
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SELECT City.Name, Country.Name, CountryLanguage.Language
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FROM City,Country,CountryLanguage
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WHERE City.Country=Country.Code AND
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CountryLanguage.Country=Country.Code AND
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City.Name LIKE 'L%' AND Country.Population > 3000000 AND
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CountryLanguage.Percentage > 50;
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Name Name Language
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Leiden Netherlands Dutch
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La Matanza Argentina Spanish
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Lomas de Zamora Argentina Spanish
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La Plata Argentina Spanish
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Lanús Argentina Spanish
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Las Heras Argentina Spanish
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La Rioja Argentina Spanish
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Liège Belgium Dutch
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La Paz Bolivia Spanish
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Londrina Brazil Portuguese
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Limeira Brazil Portuguese
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Lages Brazil Portuguese
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Luziânia Brazil Portuguese
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Lauro de Freitas Brazil Portuguese
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Linhares Brazil Portuguese
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London United Kingdom English
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Liverpool United Kingdom English
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Leeds United Kingdom English
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Leicester United Kingdom English
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Luton United Kingdom English
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Los Angeles Chile Spanish
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La Serena Chile Spanish
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La Romana Dominican Republic Spanish
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Loja Ecuador Spanish
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Luxor Egypt Arabic
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Las Palmas de Gran Canaria Spain Spanish
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L´Hospitalet de Llobregat Spain Spanish
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Leganés Spain Spanish
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|
León Spain Spanish
|
|
|
|
|
|
Logroño Spain Spanish
|
|
|
|
|
|
Lleida (Lérida) Spain Spanish
|
|
|
|
|
|
Le-Cap-Haïtien Haiti Haiti Creole
|
|
|
|
|
|
La Ceiba Honduras Spanish
|
|
|
|
|
|
Livorno Italy Italian
|
|
|
|
|
|
Latina Italy Italian
|
|
|
|
|
|
Lecce Italy Italian
|
|
|
|
|
|
La Spezia Italy Italian
|
|
|
|
|
|
Linz Austria German
|
|
|
|
|
|
London Canada English
|
|
|
|
|
|
Laval Canada English
|
|
|
|
|
|
Longueuil Canada English
|
|
|
|
|
|
Lanzhou China Chinese
|
|
|
|
|
|
Luoyang China Chinese
|
|
|
|
|
|
Liuzhou China Chinese
|
|
|
|
|
|
Liaoyang China Chinese
|
|
|
|
|
|
Liupanshui China Chinese
|
|
|
|
|
|
Liaoyuan China Chinese
|
|
|
|
|
|
Lianyungang China Chinese
|
|
|
|
|
|
Leshan China Chinese
|
|
|
|
|
|
Linyi China Chinese
|
|
|
|
|
|
Luzhou China Chinese
|
|
|
|
|
|
Laiwu China Chinese
|
|
|
|
|
|
Liaocheng China Chinese
|
|
|
|
|
|
Laizhou China Chinese
|
|
|
|
|
|
Linfen China Chinese
|
|
|
|
|
|
Liangcheng China Chinese
|
|
|
|
|
|
Longkou China Chinese
|
|
|
|
|
|
Langfang China Chinese
|
|
|
|
|
|
Liu´an China Chinese
|
|
|
|
|
|
Longjing China Chinese
|
|
|
|
|
|
Lengshuijiang China Chinese
|
|
|
|
|
|
Laiyang China Chinese
|
|
|
|
|
|
Longyan China Chinese
|
|
|
|
|
|
Linhe China Chinese
|
|
|
|
|
|
Leiyang China Chinese
|
|
|
|
|
|
Loudi China Chinese
|
|
|
|
|
|
Luohe China Chinese
|
|
|
|
|
|
Linqing China Chinese
|
|
|
|
|
|
Laohekou China Chinese
|
|
|
|
|
|
Linchuan China Chinese
|
|
|
|
|
|
Lhasa China Chinese
|
|
|
|
|
|
Lianyuan China Chinese
|
|
|
|
|
|
Liyang China Chinese
|
|
|
|
|
|
Liling China Chinese
|
|
|
|
|
|
Linhai China Chinese
|
|
|
|
|
|
Larisa Greece Greek
|
|
|
|
|
|
La Habana Cuba Spanish
|
|
|
|
|
|
Lilongwe Malawi Chichewa
|
|
|
|
|
|
León Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
Lázaro Cárdenas Mexico Spanish
|
|
|
|
|
|
Lagos de Moreno Mexico Spanish
|
|
|
|
|
|
Lerdo Mexico Spanish
|
|
|
|
|
|
Los Cabos Mexico Spanish
|
|
|
|
|
|
Lerma Mexico Spanish
|
|
|
|
|
|
Las Margaritas Mexico Spanish
|
|
|
|
|
|
Lashio (Lasho) Myanmar Burmese
|
|
|
|
|
|
Lalitapur Nepal Nepali
|
|
|
|
|
|
León Nicaragua Spanish
|
|
|
|
|
|
Lambaré Paraguay Spanish
|
|
|
|
|
|
Lima Peru Spanish
|
|
|
|
|
|
Lisboa Portugal Portuguese
|
|
|
|
|
|
Lódz Poland Polish
|
|
|
|
|
|
Lublin Poland Polish
|
|
|
|
|
|
Legnica Poland Polish
|
|
|
|
|
|
Lyon France French
|
|
|
|
|
|
Le Havre France French
|
|
|
|
|
|
Lille France French
|
|
|
|
|
|
Le Mans France French
|
|
|
|
|
|
Limoges France French
|
|
|
|
|
|
Linköping Sweden Swedish
|
|
|
|
|
|
Lund Sweden Swedish
|
|
|
|
|
|
Leipzig Germany German
|
|
|
|
|
|
Lübeck Germany German
|
|
|
|
|
|
Ludwigshafen am Rhein Germany German
|
|
|
|
|
|
Leverkusen Germany German
|
|
|
|
|
|
Lünen Germany German
|
|
|
|
|
|
Lahti Finland Finnish
|
|
|
|
|
|
Lausanne Switzerland German
|
|
|
|
|
|
Latakia Syria Arabic
|
|
|
|
|
|
Luchou Taiwan Min
|
|
|
|
|
|
Lungtan Taiwan Min
|
|
|
|
|
|
Liberec Czech Republic Czech
|
|
|
|
|
|
Lviv Ukraine Ukrainian
|
|
|
|
|
|
Lugansk Ukraine Ukrainian
|
|
|
|
|
|
Lutsk Ukraine Ukrainian
|
|
|
|
|
|
Lysyt?ansk Ukraine Ukrainian
|
|
|
|
|
|
Lower Hutt New Zealand English
|
|
|
|
|
|
Lida Belarus Belorussian
|
|
|
|
|
|
Los Teques Venezuela Spanish
|
|
|
|
|
|
Lipetsk Russian Federation Russian
|
|
|
|
|
|
Ljubertsy Russian Federation Russian
|
|
|
|
|
|
Leninsk-Kuznetski Russian Federation Russian
|
|
|
|
|
|
Long Xuyen Vietnam Vietnamese
|
|
|
|
|
|
Los Angeles United States English
|
|
|
|
|
|
Las Vegas United States English
|
|
|
|
|
|
Long Beach United States English
|
|
|
|
|
|
Lexington-Fayette United States English
|
|
|
|
|
|
Louisville United States English
|
|
|
|
|
|
Lincoln United States English
|
|
|
|
|
|
Lubbock United States English
|
|
|
|
|
|
Little Rock United States English
|
|
|
|
|
|
Laredo United States English
|
|
|
|
|
|
Lakewood United States English
|
|
|
|
|
|
Lansing United States English
|
|
|
|
|
|
Lancaster United States English
|
|
|
|
|
|
Lafayette United States English
|
|
|
|
|
|
Lowell United States English
|
|
|
|
|
|
Livonia United States English
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
set join_buffer_size=256;
|
|
|
|
|
|
show variables like 'join_buffer_size';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_buffer_size 256
|
|
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_cache_level 1
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
|
|
|
|
|
1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
|
|
|
|
|
1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
Name Name Language
|
|
|
|
|
|
Leiden Netherlands Dutch
|
|
|
|
|
|
La Matanza Argentina Spanish
|
|
|
|
|
|
Lomas de Zamora Argentina Spanish
|
|
|
|
|
|
La Plata Argentina Spanish
|
|
|
|
|
|
Lanús Argentina Spanish
|
|
|
|
|
|
Las Heras Argentina Spanish
|
|
|
|
|
|
La Rioja Argentina Spanish
|
|
|
|
|
|
Liège Belgium Dutch
|
|
|
|
|
|
La Paz Bolivia Spanish
|
|
|
|
|
|
Londrina Brazil Portuguese
|
|
|
|
|
|
Limeira Brazil Portuguese
|
|
|
|
|
|
Lages Brazil Portuguese
|
|
|
|
|
|
Luziânia Brazil Portuguese
|
|
|
|
|
|
Lauro de Freitas Brazil Portuguese
|
|
|
|
|
|
Linhares Brazil Portuguese
|
|
|
|
|
|
London United Kingdom English
|
|
|
|
|
|
Liverpool United Kingdom English
|
|
|
|
|
|
Leeds United Kingdom English
|
|
|
|
|
|
Leicester United Kingdom English
|
|
|
|
|
|
Luton United Kingdom English
|
|
|
|
|
|
Los Angeles Chile Spanish
|
|
|
|
|
|
La Serena Chile Spanish
|
|
|
|
|
|
La Romana Dominican Republic Spanish
|
|
|
|
|
|
Loja Ecuador Spanish
|
|
|
|
|
|
Luxor Egypt Arabic
|
|
|
|
|
|
Las Palmas de Gran Canaria Spain Spanish
|
|
|
|
|
|
L´Hospitalet de Llobregat Spain Spanish
|
|
|
|
|
|
Leganés Spain Spanish
|
|
|
|
|
|
León Spain Spanish
|
|
|
|
|
|
Logroño Spain Spanish
|
|
|
|
|
|
Lleida (Lérida) Spain Spanish
|
|
|
|
|
|
Le-Cap-Haïtien Haiti Haiti Creole
|
|
|
|
|
|
La Ceiba Honduras Spanish
|
|
|
|
|
|
Livorno Italy Italian
|
|
|
|
|
|
Latina Italy Italian
|
|
|
|
|
|
Lecce Italy Italian
|
|
|
|
|
|
La Spezia Italy Italian
|
|
|
|
|
|
Linz Austria German
|
|
|
|
|
|
London Canada English
|
|
|
|
|
|
Laval Canada English
|
|
|
|
|
|
Longueuil Canada English
|
|
|
|
|
|
Lanzhou China Chinese
|
|
|
|
|
|
Luoyang China Chinese
|
|
|
|
|
|
Liuzhou China Chinese
|
|
|
|
|
|
Liaoyang China Chinese
|
|
|
|
|
|
Liupanshui China Chinese
|
|
|
|
|
|
Liaoyuan China Chinese
|
|
|
|
|
|
Lianyungang China Chinese
|
|
|
|
|
|
Leshan China Chinese
|
|
|
|
|
|
Linyi China Chinese
|
|
|
|
|
|
Luzhou China Chinese
|
|
|
|
|
|
Laiwu China Chinese
|
|
|
|
|
|
Liaocheng China Chinese
|
|
|
|
|
|
Laizhou China Chinese
|
|
|
|
|
|
Linfen China Chinese
|
|
|
|
|
|
Liangcheng China Chinese
|
|
|
|
|
|
Longkou China Chinese
|
|
|
|
|
|
Langfang China Chinese
|
|
|
|
|
|
Liu´an China Chinese
|
|
|
|
|
|
Longjing China Chinese
|
|
|
|
|
|
Lengshuijiang China Chinese
|
|
|
|
|
|
Laiyang China Chinese
|
|
|
|
|
|
Longyan China Chinese
|
|
|
|
|
|
Linhe China Chinese
|
|
|
|
|
|
Leiyang China Chinese
|
|
|
|
|
|
Loudi China Chinese
|
|
|
|
|
|
Luohe China Chinese
|
|
|
|
|
|
Linqing China Chinese
|
|
|
|
|
|
Laohekou China Chinese
|
|
|
|
|
|
Linchuan China Chinese
|
|
|
|
|
|
Lhasa China Chinese
|
|
|
|
|
|
Lianyuan China Chinese
|
|
|
|
|
|
Liyang China Chinese
|
|
|
|
|
|
Liling China Chinese
|
|
|
|
|
|
Linhai China Chinese
|
|
|
|
|
|
Larisa Greece Greek
|
|
|
|
|
|
La Habana Cuba Spanish
|
|
|
|
|
|
Lilongwe Malawi Chichewa
|
|
|
|
|
|
León Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
Lázaro Cárdenas Mexico Spanish
|
|
|
|
|
|
Lagos de Moreno Mexico Spanish
|
|
|
|
|
|
Lerdo Mexico Spanish
|
|
|
|
|
|
Los Cabos Mexico Spanish
|
|
|
|
|
|
Lerma Mexico Spanish
|
|
|
|
|
|
Las Margaritas Mexico Spanish
|
|
|
|
|
|
Lashio (Lasho) Myanmar Burmese
|
|
|
|
|
|
Lalitapur Nepal Nepali
|
|
|
|
|
|
León Nicaragua Spanish
|
|
|
|
|
|
Lambaré Paraguay Spanish
|
|
|
|
|
|
Lima Peru Spanish
|
|
|
|
|
|
Lisboa Portugal Portuguese
|
|
|
|
|
|
Lódz Poland Polish
|
|
|
|
|
|
Lublin Poland Polish
|
|
|
|
|
|
Legnica Poland Polish
|
|
|
|
|
|
Lyon France French
|
|
|
|
|
|
Le Havre France French
|
|
|
|
|
|
Lille France French
|
|
|
|
|
|
Le Mans France French
|
|
|
|
|
|
Limoges France French
|
|
|
|
|
|
Linköping Sweden Swedish
|
|
|
|
|
|
Lund Sweden Swedish
|
|
|
|
|
|
Leipzig Germany German
|
|
|
|
|
|
Lübeck Germany German
|
|
|
|
|
|
Ludwigshafen am Rhein Germany German
|
|
|
|
|
|
Leverkusen Germany German
|
|
|
|
|
|
Lünen Germany German
|
|
|
|
|
|
Lahti Finland Finnish
|
|
|
|
|
|
Lausanne Switzerland German
|
|
|
|
|
|
Latakia Syria Arabic
|
|
|
|
|
|
Luchou Taiwan Min
|
|
|
|
|
|
Lungtan Taiwan Min
|
|
|
|
|
|
Liberec Czech Republic Czech
|
|
|
|
|
|
Lviv Ukraine Ukrainian
|
|
|
|
|
|
Lugansk Ukraine Ukrainian
|
|
|
|
|
|
Lutsk Ukraine Ukrainian
|
|
|
|
|
|
Lysyt?ansk Ukraine Ukrainian
|
|
|
|
|
|
Lower Hutt New Zealand English
|
|
|
|
|
|
Lida Belarus Belorussian
|
|
|
|
|
|
Los Teques Venezuela Spanish
|
|
|
|
|
|
Lipetsk Russian Federation Russian
|
|
|
|
|
|
Ljubertsy Russian Federation Russian
|
|
|
|
|
|
Leninsk-Kuznetski Russian Federation Russian
|
|
|
|
|
|
Long Xuyen Vietnam Vietnamese
|
|
|
|
|
|
Los Angeles United States English
|
|
|
|
|
|
Las Vegas United States English
|
|
|
|
|
|
Long Beach United States English
|
|
|
|
|
|
Lexington-Fayette United States English
|
|
|
|
|
|
Louisville United States English
|
|
|
|
|
|
Lincoln United States English
|
|
|
|
|
|
Lubbock United States English
|
|
|
|
|
|
Little Rock United States English
|
|
|
|
|
|
Laredo United States English
|
|
|
|
|
|
Lakewood United States English
|
|
|
|
|
|
Lansing United States English
|
|
|
|
|
|
Lancaster United States English
|
|
|
|
|
|
Lafayette United States English
|
|
|
|
|
|
Lowell United States English
|
|
|
|
|
|
Livonia United States English
|
|
|
|
|
|
set join_cache_level=2;
|
|
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_cache_level 2
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
|
|
|
|
|
1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
|
|
|
|
|
1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
Name Name Language
|
|
|
|
|
|
Leiden Netherlands Dutch
|
|
|
|
|
|
La Matanza Argentina Spanish
|
|
|
|
|
|
Lomas de Zamora Argentina Spanish
|
|
|
|
|
|
La Plata Argentina Spanish
|
|
|
|
|
|
Lanús Argentina Spanish
|
|
|
|
|
|
Las Heras Argentina Spanish
|
|
|
|
|
|
La Rioja Argentina Spanish
|
|
|
|
|
|
Liège Belgium Dutch
|
|
|
|
|
|
La Paz Bolivia Spanish
|
|
|
|
|
|
Londrina Brazil Portuguese
|
|
|
|
|
|
Limeira Brazil Portuguese
|
|
|
|
|
|
Lages Brazil Portuguese
|
|
|
|
|
|
Luziânia Brazil Portuguese
|
|
|
|
|
|
Lauro de Freitas Brazil Portuguese
|
|
|
|
|
|
Linhares Brazil Portuguese
|
|
|
|
|
|
London United Kingdom English
|
|
|
|
|
|
Liverpool United Kingdom English
|
|
|
|
|
|
Leeds United Kingdom English
|
|
|
|
|
|
Leicester United Kingdom English
|
|
|
|
|
|
Luton United Kingdom English
|
|
|
|
|
|
Los Angeles Chile Spanish
|
|
|
|
|
|
La Serena Chile Spanish
|
|
|
|
|
|
La Romana Dominican Republic Spanish
|
|
|
|
|
|
Loja Ecuador Spanish
|
|
|
|
|
|
Luxor Egypt Arabic
|
|
|
|
|
|
Las Palmas de Gran Canaria Spain Spanish
|
|
|
|
|
|
L´Hospitalet de Llobregat Spain Spanish
|
|
|
|
|
|
Leganés Spain Spanish
|
|
|
|
|
|
León Spain Spanish
|
|
|
|
|
|
Logroño Spain Spanish
|
|
|
|
|
|
Lleida (Lérida) Spain Spanish
|
|
|
|
|
|
Le-Cap-Haïtien Haiti Haiti Creole
|
|
|
|
|
|
La Ceiba Honduras Spanish
|
|
|
|
|
|
Livorno Italy Italian
|
|
|
|
|
|
Latina Italy Italian
|
|
|
|
|
|
Lecce Italy Italian
|
|
|
|
|
|
La Spezia Italy Italian
|
|
|
|
|
|
Linz Austria German
|
|
|
|
|
|
London Canada English
|
|
|
|
|
|
Laval Canada English
|
|
|
|
|
|
Longueuil Canada English
|
|
|
|
|
|
Lanzhou China Chinese
|
|
|
|
|
|
Luoyang China Chinese
|
|
|
|
|
|
Liuzhou China Chinese
|
|
|
|
|
|
Liaoyang China Chinese
|
|
|
|
|
|
Liupanshui China Chinese
|
|
|
|
|
|
Liaoyuan China Chinese
|
|
|
|
|
|
Lianyungang China Chinese
|
|
|
|
|
|
Leshan China Chinese
|
|
|
|
|
|
Linyi China Chinese
|
|
|
|
|
|
Luzhou China Chinese
|
|
|
|
|
|
Laiwu China Chinese
|
|
|
|
|
|
Liaocheng China Chinese
|
|
|
|
|
|
Laizhou China Chinese
|
|
|
|
|
|
Linfen China Chinese
|
|
|
|
|
|
Liangcheng China Chinese
|
|
|
|
|
|
Longkou China Chinese
|
|
|
|
|
|
Langfang China Chinese
|
|
|
|
|
|
Liu´an China Chinese
|
|
|
|
|
|
Longjing China Chinese
|
|
|
|
|
|
Lengshuijiang China Chinese
|
|
|
|
|
|
Laiyang China Chinese
|
|
|
|
|
|
Longyan China Chinese
|
|
|
|
|
|
Linhe China Chinese
|
|
|
|
|
|
Leiyang China Chinese
|
|
|
|
|
|
Loudi China Chinese
|
|
|
|
|
|
Luohe China Chinese
|
|
|
|
|
|
Linqing China Chinese
|
|
|
|
|
|
Laohekou China Chinese
|
|
|
|
|
|
Linchuan China Chinese
|
|
|
|
|
|
Lhasa China Chinese
|
|
|
|
|
|
Lianyuan China Chinese
|
|
|
|
|
|
Liyang China Chinese
|
|
|
|
|
|
Liling China Chinese
|
|
|
|
|
|
Linhai China Chinese
|
|
|
|
|
|
Larisa Greece Greek
|
|
|
|
|
|
La Habana Cuba Spanish
|
|
|
|
|
|
Lilongwe Malawi Chichewa
|
|
|
|
|
|
León Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
Lázaro Cárdenas Mexico Spanish
|
|
|
|
|
|
Lagos de Moreno Mexico Spanish
|
|
|
|
|
|
Lerdo Mexico Spanish
|
|
|
|
|
|
Los Cabos Mexico Spanish
|
|
|
|
|
|
Lerma Mexico Spanish
|
|
|
|
|
|
Las Margaritas Mexico Spanish
|
|
|
|
|
|
Lashio (Lasho) Myanmar Burmese
|
|
|
|
|
|
Lalitapur Nepal Nepali
|
|
|
|
|
|
León Nicaragua Spanish
|
|
|
|
|
|
Lambaré Paraguay Spanish
|
|
|
|
|
|
Lima Peru Spanish
|
|
|
|
|
|
Lisboa Portugal Portuguese
|
|
|
|
|
|
Lódz Poland Polish
|
|
|
|
|
|
Lublin Poland Polish
|
|
|
|
|
|
Legnica Poland Polish
|
|
|
|
|
|
Lyon France French
|
|
|
|
|
|
Le Havre France French
|
|
|
|
|
|
Lille France French
|
|
|
|
|
|
Le Mans France French
|
|
|
|
|
|
Limoges France French
|
|
|
|
|
|
Linköping Sweden Swedish
|
|
|
|
|
|
Lund Sweden Swedish
|
|
|
|
|
|
Leipzig Germany German
|
|
|
|
|
|
Lübeck Germany German
|
|
|
|
|
|
Ludwigshafen am Rhein Germany German
|
|
|
|
|
|
Leverkusen Germany German
|
|
|
|
|
|
Lünen Germany German
|
|
|
|
|
|
Lahti Finland Finnish
|
|
|
|
|
|
Lausanne Switzerland German
|
|
|
|
|
|
Latakia Syria Arabic
|
|
|
|
|
|
Luchou Taiwan Min
|
|
|
|
|
|
Lungtan Taiwan Min
|
|
|
|
|
|
Liberec Czech Republic Czech
|
|
|
|
|
|
Lviv Ukraine Ukrainian
|
|
|
|
|
|
Lugansk Ukraine Ukrainian
|
|
|
|
|
|
Lutsk Ukraine Ukrainian
|
|
|
|
|
|
Lysyt?ansk Ukraine Ukrainian
|
|
|
|
|
|
Lower Hutt New Zealand English
|
|
|
|
|
|
Lida Belarus Belorussian
|
|
|
|
|
|
Los Teques Venezuela Spanish
|
|
|
|
|
|
Lipetsk Russian Federation Russian
|
|
|
|
|
|
Ljubertsy Russian Federation Russian
|
|
|
|
|
|
Leninsk-Kuznetski Russian Federation Russian
|
|
|
|
|
|
Long Xuyen Vietnam Vietnamese
|
|
|
|
|
|
Los Angeles United States English
|
|
|
|
|
|
Las Vegas United States English
|
|
|
|
|
|
Long Beach United States English
|
|
|
|
|
|
Lexington-Fayette United States English
|
|
|
|
|
|
Louisville United States English
|
|
|
|
|
|
Lincoln United States English
|
|
|
|
|
|
Lubbock United States English
|
|
|
|
|
|
Little Rock United States English
|
|
|
|
|
|
Laredo United States English
|
|
|
|
|
|
Lakewood United States English
|
|
|
|
|
|
Lansing United States English
|
|
|
|
|
|
Lancaster United States English
|
|
|
|
|
|
Lafayette United States English
|
|
|
|
|
|
Lowell United States English
|
|
|
|
|
|
Livonia United States English
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
set join_buffer_size=default;
|
|
|
|
|
|
show variables like 'join_buffer_size';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_buffer_size 131072
|
|
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_cache_level 1
|
|
|
|
|
|
DROP DATABASE world;
|
|
|
|
|
|
CREATE DATABASE world;
|
|
|
|
|
|
use world;
|
|
|
|
|
|
CREATE TABLE Country (
|
|
|
|
|
|
Code char(3) NOT NULL default '',
|
|
|
|
|
|
Name char(52) NOT NULL default '',
|
|
|
|
|
|
SurfaceArea float(10,2) NOT NULL default '0.00',
|
|
|
|
|
|
Population int(11) NOT NULL default '0',
|
|
|
|
|
|
Capital int(11) default NULL,
|
|
|
|
|
|
PRIMARY KEY (Code),
|
|
|
|
|
|
UNIQUE INDEX (Name)
|
|
|
|
|
|
);
|
|
|
|
|
|
CREATE TABLE City (
|
|
|
|
|
|
ID int(11) NOT NULL auto_increment,
|
|
|
|
|
|
Name char(35) NOT NULL default '',
|
|
|
|
|
|
Country char(3) NOT NULL default '',
|
|
|
|
|
|
Population int(11) NOT NULL default '0',
|
|
|
|
|
|
PRIMARY KEY (ID),
|
|
|
|
|
|
INDEX (Population),
|
|
|
|
|
|
INDEX (Country)
|
|
|
|
|
|
);
|
|
|
|
|
|
CREATE TABLE CountryLanguage (
|
|
|
|
|
|
Country char(3) NOT NULL default '',
|
|
|
|
|
|
Language char(30) NOT NULL default '',
|
|
|
|
|
|
Percentage float(3,1) NOT NULL default '0.0',
|
|
|
|
|
|
PRIMARY KEY (Country, Language),
|
|
|
|
|
|
INDEX (Percentage)
|
|
|
|
|
|
);
|
|
|
|
|
|
show variables like 'join_buffer_size';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_buffer_size 131072
|
2010-08-31 18:34:21 +02:00
|
|
|
|
set join_cache_level=3;
|
|
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_cache_level 3
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where
|
|
|
|
|
|
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE City ref Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
Name Name Language
|
|
|
|
|
|
Leiden Netherlands Dutch
|
|
|
|
|
|
La Matanza Argentina Spanish
|
|
|
|
|
|
Lomas de Zamora Argentina Spanish
|
|
|
|
|
|
La Plata Argentina Spanish
|
|
|
|
|
|
Lanús Argentina Spanish
|
|
|
|
|
|
Las Heras Argentina Spanish
|
|
|
|
|
|
La Rioja Argentina Spanish
|
|
|
|
|
|
Liège Belgium Dutch
|
|
|
|
|
|
La Paz Bolivia Spanish
|
|
|
|
|
|
Londrina Brazil Portuguese
|
|
|
|
|
|
Limeira Brazil Portuguese
|
|
|
|
|
|
Lages Brazil Portuguese
|
|
|
|
|
|
Luziânia Brazil Portuguese
|
|
|
|
|
|
Lauro de Freitas Brazil Portuguese
|
|
|
|
|
|
Linhares Brazil Portuguese
|
|
|
|
|
|
London United Kingdom English
|
|
|
|
|
|
Liverpool United Kingdom English
|
|
|
|
|
|
Leeds United Kingdom English
|
|
|
|
|
|
Leicester United Kingdom English
|
|
|
|
|
|
Luton United Kingdom English
|
|
|
|
|
|
Los Angeles Chile Spanish
|
|
|
|
|
|
La Serena Chile Spanish
|
|
|
|
|
|
La Romana Dominican Republic Spanish
|
|
|
|
|
|
Loja Ecuador Spanish
|
|
|
|
|
|
Luxor Egypt Arabic
|
|
|
|
|
|
Las Palmas de Gran Canaria Spain Spanish
|
|
|
|
|
|
L´Hospitalet de Llobregat Spain Spanish
|
|
|
|
|
|
Leganés Spain Spanish
|
|
|
|
|
|
León Spain Spanish
|
|
|
|
|
|
Logroño Spain Spanish
|
|
|
|
|
|
Lleida (Lérida) Spain Spanish
|
|
|
|
|
|
Le-Cap-Haïtien Haiti Haiti Creole
|
|
|
|
|
|
La Ceiba Honduras Spanish
|
|
|
|
|
|
Livorno Italy Italian
|
|
|
|
|
|
Latina Italy Italian
|
|
|
|
|
|
Lecce Italy Italian
|
|
|
|
|
|
La Spezia Italy Italian
|
|
|
|
|
|
Linz Austria German
|
|
|
|
|
|
London Canada English
|
|
|
|
|
|
Laval Canada English
|
|
|
|
|
|
Longueuil Canada English
|
|
|
|
|
|
Lanzhou China Chinese
|
|
|
|
|
|
Luoyang China Chinese
|
|
|
|
|
|
Liuzhou China Chinese
|
|
|
|
|
|
Liaoyang China Chinese
|
|
|
|
|
|
Liupanshui China Chinese
|
|
|
|
|
|
Liaoyuan China Chinese
|
|
|
|
|
|
Lianyungang China Chinese
|
|
|
|
|
|
Leshan China Chinese
|
|
|
|
|
|
Linyi China Chinese
|
|
|
|
|
|
Luzhou China Chinese
|
|
|
|
|
|
Laiwu China Chinese
|
|
|
|
|
|
Liaocheng China Chinese
|
|
|
|
|
|
Laizhou China Chinese
|
|
|
|
|
|
Linfen China Chinese
|
|
|
|
|
|
Liangcheng China Chinese
|
|
|
|
|
|
Longkou China Chinese
|
|
|
|
|
|
Langfang China Chinese
|
|
|
|
|
|
Liu´an China Chinese
|
|
|
|
|
|
Longjing China Chinese
|
|
|
|
|
|
Lengshuijiang China Chinese
|
|
|
|
|
|
Laiyang China Chinese
|
|
|
|
|
|
Longyan China Chinese
|
|
|
|
|
|
Linhe China Chinese
|
|
|
|
|
|
Leiyang China Chinese
|
|
|
|
|
|
Loudi China Chinese
|
|
|
|
|
|
Luohe China Chinese
|
|
|
|
|
|
Linqing China Chinese
|
|
|
|
|
|
Laohekou China Chinese
|
|
|
|
|
|
Linchuan China Chinese
|
|
|
|
|
|
Lhasa China Chinese
|
|
|
|
|
|
Lianyuan China Chinese
|
|
|
|
|
|
Liyang China Chinese
|
|
|
|
|
|
Liling China Chinese
|
|
|
|
|
|
Linhai China Chinese
|
|
|
|
|
|
Larisa Greece Greek
|
|
|
|
|
|
La Habana Cuba Spanish
|
|
|
|
|
|
Lilongwe Malawi Chichewa
|
|
|
|
|
|
León Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
Lázaro Cárdenas Mexico Spanish
|
|
|
|
|
|
Lagos de Moreno Mexico Spanish
|
|
|
|
|
|
Lerdo Mexico Spanish
|
|
|
|
|
|
Los Cabos Mexico Spanish
|
|
|
|
|
|
Lerma Mexico Spanish
|
|
|
|
|
|
Las Margaritas Mexico Spanish
|
|
|
|
|
|
Lashio (Lasho) Myanmar Burmese
|
|
|
|
|
|
Lalitapur Nepal Nepali
|
|
|
|
|
|
León Nicaragua Spanish
|
|
|
|
|
|
Lambaré Paraguay Spanish
|
|
|
|
|
|
Lima Peru Spanish
|
|
|
|
|
|
Lisboa Portugal Portuguese
|
|
|
|
|
|
Lódz Poland Polish
|
|
|
|
|
|
Lublin Poland Polish
|
|
|
|
|
|
Legnica Poland Polish
|
|
|
|
|
|
Lyon France French
|
|
|
|
|
|
Le Havre France French
|
|
|
|
|
|
Lille France French
|
|
|
|
|
|
Le Mans France French
|
|
|
|
|
|
Limoges France French
|
|
|
|
|
|
Linköping Sweden Swedish
|
|
|
|
|
|
Lund Sweden Swedish
|
|
|
|
|
|
Leipzig Germany German
|
|
|
|
|
|
Lübeck Germany German
|
|
|
|
|
|
Ludwigshafen am Rhein Germany German
|
|
|
|
|
|
Leverkusen Germany German
|
|
|
|
|
|
Lünen Germany German
|
|
|
|
|
|
Lahti Finland Finnish
|
|
|
|
|
|
Lausanne Switzerland German
|
|
|
|
|
|
Latakia Syria Arabic
|
|
|
|
|
|
Luchou Taiwan Min
|
|
|
|
|
|
Lungtan Taiwan Min
|
|
|
|
|
|
Liberec Czech Republic Czech
|
|
|
|
|
|
Lviv Ukraine Ukrainian
|
|
|
|
|
|
Lugansk Ukraine Ukrainian
|
|
|
|
|
|
Lutsk Ukraine Ukrainian
|
|
|
|
|
|
Lysyt?ansk Ukraine Ukrainian
|
|
|
|
|
|
Lower Hutt New Zealand English
|
|
|
|
|
|
Lida Belarus Belorussian
|
|
|
|
|
|
Los Teques Venezuela Spanish
|
|
|
|
|
|
Lipetsk Russian Federation Russian
|
|
|
|
|
|
Ljubertsy Russian Federation Russian
|
|
|
|
|
|
Leninsk-Kuznetski Russian Federation Russian
|
|
|
|
|
|
Long Xuyen Vietnam Vietnamese
|
|
|
|
|
|
Los Angeles United States English
|
|
|
|
|
|
Las Vegas United States English
|
|
|
|
|
|
Long Beach United States English
|
|
|
|
|
|
Lexington-Fayette United States English
|
|
|
|
|
|
Louisville United States English
|
|
|
|
|
|
Lincoln United States English
|
|
|
|
|
|
Lubbock United States English
|
|
|
|
|
|
Little Rock United States English
|
|
|
|
|
|
Laredo United States English
|
|
|
|
|
|
Lakewood United States English
|
|
|
|
|
|
Lansing United States English
|
|
|
|
|
|
Lancaster United States English
|
|
|
|
|
|
Lafayette United States English
|
|
|
|
|
|
Lowell United States English
|
|
|
|
|
|
Livonia United States English
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
Name
|
|
|
|
|
|
Vientiane
|
|
|
|
|
|
Riga
|
|
|
|
|
|
Daugavpils
|
|
|
|
|
|
Maseru
|
|
|
|
|
|
Beirut
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Monrovia
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Bengasi
|
|
|
|
|
|
Misrata
|
|
|
|
|
|
Vilnius
|
|
|
|
|
|
Kaunas
|
|
|
|
|
|
Klaipeda
|
|
|
|
|
|
?iauliai
|
|
|
|
|
|
Panevezys
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
FROM Country LEFT JOIN CountryLanguage ON
|
|
|
|
|
|
(CountryLanguage.Country=Country.Code AND Language='English')
|
|
|
|
|
|
WHERE
|
|
|
|
|
|
Country.Population > 10000000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
|
|
|
|
|
1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer
|
|
|
|
|
|
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
FROM Country LEFT JOIN CountryLanguage ON
|
|
|
|
|
|
(CountryLanguage.Country=Country.Code AND Language='English')
|
|
|
|
|
|
WHERE
|
|
|
|
|
|
Country.Population > 10000000;
|
|
|
|
|
|
Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
Australia 81.2
|
|
|
|
|
|
United Kingdom 97.3
|
|
|
|
|
|
Canada 60.4
|
|
|
|
|
|
United States 86.2
|
|
|
|
|
|
Zimbabwe 2.2
|
|
|
|
|
|
Japan 0.1
|
|
|
|
|
|
South Africa 8.5
|
|
|
|
|
|
Malaysia 1.6
|
|
|
|
|
|
Afghanistan NULL
|
|
|
|
|
|
Netherlands NULL
|
|
|
|
|
|
Algeria NULL
|
|
|
|
|
|
Angola NULL
|
|
|
|
|
|
Argentina NULL
|
|
|
|
|
|
Bangladesh NULL
|
|
|
|
|
|
Belgium NULL
|
|
|
|
|
|
Brazil NULL
|
|
|
|
|
|
Burkina Faso NULL
|
|
|
|
|
|
Chile NULL
|
|
|
|
|
|
Ecuador NULL
|
|
|
|
|
|
Egypt NULL
|
|
|
|
|
|
Spain NULL
|
|
|
|
|
|
Ethiopia NULL
|
|
|
|
|
|
Philippines NULL
|
|
|
|
|
|
Ghana NULL
|
|
|
|
|
|
Guatemala NULL
|
|
|
|
|
|
Indonesia NULL
|
|
|
|
|
|
India NULL
|
|
|
|
|
|
Iraq NULL
|
|
|
|
|
|
Iran NULL
|
|
|
|
|
|
Italy NULL
|
|
|
|
|
|
Yemen NULL
|
|
|
|
|
|
Yugoslavia NULL
|
|
|
|
|
|
Cambodia NULL
|
|
|
|
|
|
Cameroon NULL
|
|
|
|
|
|
Kazakstan NULL
|
|
|
|
|
|
Kenya NULL
|
|
|
|
|
|
China NULL
|
|
|
|
|
|
Colombia NULL
|
|
|
|
|
|
Congo, The Democratic Republic of the NULL
|
|
|
|
|
|
North Korea NULL
|
|
|
|
|
|
South Korea NULL
|
|
|
|
|
|
Greece NULL
|
|
|
|
|
|
Cuba NULL
|
|
|
|
|
|
Madagascar NULL
|
|
|
|
|
|
Malawi NULL
|
|
|
|
|
|
Mali NULL
|
|
|
|
|
|
Morocco NULL
|
|
|
|
|
|
Mexico NULL
|
|
|
|
|
|
Mozambique NULL
|
|
|
|
|
|
Myanmar NULL
|
|
|
|
|
|
Nepal NULL
|
|
|
|
|
|
Niger NULL
|
|
|
|
|
|
Nigeria NULL
|
|
|
|
|
|
Côte d?Ivoire NULL
|
|
|
|
|
|
Pakistan NULL
|
|
|
|
|
|
Peru NULL
|
|
|
|
|
|
Poland NULL
|
|
|
|
|
|
France NULL
|
|
|
|
|
|
Romania NULL
|
|
|
|
|
|
Germany NULL
|
|
|
|
|
|
Saudi Arabia NULL
|
|
|
|
|
|
Somalia NULL
|
|
|
|
|
|
Sri Lanka NULL
|
|
|
|
|
|
Sudan NULL
|
|
|
|
|
|
Syria NULL
|
|
|
|
|
|
Taiwan NULL
|
|
|
|
|
|
Tanzania NULL
|
|
|
|
|
|
Thailand NULL
|
|
|
|
|
|
Czech Republic NULL
|
|
|
|
|
|
Turkey NULL
|
|
|
|
|
|
Uganda NULL
|
|
|
|
|
|
Ukraine NULL
|
|
|
|
|
|
Hungary NULL
|
|
|
|
|
|
Uzbekistan NULL
|
|
|
|
|
|
Belarus NULL
|
|
|
|
|
|
Venezuela NULL
|
|
|
|
|
|
Russian Federation NULL
|
|
|
|
|
|
Vietnam NULL
|
|
|
|
|
|
show variables like 'join_buffer_size';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_buffer_size 131072
|
|
|
|
|
|
set join_cache_level=4;
|
|
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_cache_level 4
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where
|
|
|
|
|
|
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE City ref Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
Name Name Language
|
|
|
|
|
|
Leiden Netherlands Dutch
|
|
|
|
|
|
La Matanza Argentina Spanish
|
|
|
|
|
|
Lomas de Zamora Argentina Spanish
|
|
|
|
|
|
La Plata Argentina Spanish
|
|
|
|
|
|
Lanús Argentina Spanish
|
|
|
|
|
|
Las Heras Argentina Spanish
|
|
|
|
|
|
La Rioja Argentina Spanish
|
|
|
|
|
|
Liège Belgium Dutch
|
|
|
|
|
|
La Paz Bolivia Spanish
|
|
|
|
|
|
Londrina Brazil Portuguese
|
|
|
|
|
|
Limeira Brazil Portuguese
|
|
|
|
|
|
Lages Brazil Portuguese
|
|
|
|
|
|
Luziânia Brazil Portuguese
|
|
|
|
|
|
Lauro de Freitas Brazil Portuguese
|
|
|
|
|
|
Linhares Brazil Portuguese
|
|
|
|
|
|
London United Kingdom English
|
|
|
|
|
|
Liverpool United Kingdom English
|
|
|
|
|
|
Leeds United Kingdom English
|
|
|
|
|
|
Leicester United Kingdom English
|
|
|
|
|
|
Luton United Kingdom English
|
|
|
|
|
|
Los Angeles Chile Spanish
|
|
|
|
|
|
La Serena Chile Spanish
|
|
|
|
|
|
La Romana Dominican Republic Spanish
|
|
|
|
|
|
Loja Ecuador Spanish
|
|
|
|
|
|
Luxor Egypt Arabic
|
|
|
|
|
|
Las Palmas de Gran Canaria Spain Spanish
|
|
|
|
|
|
L´Hospitalet de Llobregat Spain Spanish
|
|
|
|
|
|
Leganés Spain Spanish
|
|
|
|
|
|
León Spain Spanish
|
|
|
|
|
|
Logroño Spain Spanish
|
|
|
|
|
|
Lleida (Lérida) Spain Spanish
|
|
|
|
|
|
Le-Cap-Haïtien Haiti Haiti Creole
|
|
|
|
|
|
La Ceiba Honduras Spanish
|
|
|
|
|
|
Livorno Italy Italian
|
|
|
|
|
|
Latina Italy Italian
|
|
|
|
|
|
Lecce Italy Italian
|
|
|
|
|
|
La Spezia Italy Italian
|
|
|
|
|
|
Linz Austria German
|
|
|
|
|
|
London Canada English
|
|
|
|
|
|
Laval Canada English
|
|
|
|
|
|
Longueuil Canada English
|
|
|
|
|
|
Lanzhou China Chinese
|
|
|
|
|
|
Luoyang China Chinese
|
|
|
|
|
|
Liuzhou China Chinese
|
|
|
|
|
|
Liaoyang China Chinese
|
|
|
|
|
|
Liupanshui China Chinese
|
|
|
|
|
|
Liaoyuan China Chinese
|
|
|
|
|
|
Lianyungang China Chinese
|
|
|
|
|
|
Leshan China Chinese
|
|
|
|
|
|
Linyi China Chinese
|
|
|
|
|
|
Luzhou China Chinese
|
|
|
|
|
|
Laiwu China Chinese
|
|
|
|
|
|
Liaocheng China Chinese
|
|
|
|
|
|
Laizhou China Chinese
|
|
|
|
|
|
Linfen China Chinese
|
|
|
|
|
|
Liangcheng China Chinese
|
|
|
|
|
|
Longkou China Chinese
|
|
|
|
|
|
Langfang China Chinese
|
|
|
|
|
|
Liu´an China Chinese
|
|
|
|
|
|
Longjing China Chinese
|
|
|
|
|
|
Lengshuijiang China Chinese
|
|
|
|
|
|
Laiyang China Chinese
|
|
|
|
|
|
Longyan China Chinese
|
|
|
|
|
|
Linhe China Chinese
|
|
|
|
|
|
Leiyang China Chinese
|
|
|
|
|
|
Loudi China Chinese
|
|
|
|
|
|
Luohe China Chinese
|
|
|
|
|
|
Linqing China Chinese
|
|
|
|
|
|
Laohekou China Chinese
|
|
|
|
|
|
Linchuan China Chinese
|
|
|
|
|
|
Lhasa China Chinese
|
|
|
|
|
|
Lianyuan China Chinese
|
|
|
|
|
|
Liyang China Chinese
|
|
|
|
|
|
Liling China Chinese
|
|
|
|
|
|
Linhai China Chinese
|
|
|
|
|
|
Larisa Greece Greek
|
|
|
|
|
|
La Habana Cuba Spanish
|
|
|
|
|
|
Lilongwe Malawi Chichewa
|
|
|
|
|
|
León Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
Lázaro Cárdenas Mexico Spanish
|
|
|
|
|
|
Lagos de Moreno Mexico Spanish
|
|
|
|
|
|
Lerdo Mexico Spanish
|
|
|
|
|
|
Los Cabos Mexico Spanish
|
|
|
|
|
|
Lerma Mexico Spanish
|
|
|
|
|
|
Las Margaritas Mexico Spanish
|
|
|
|
|
|
Lashio (Lasho) Myanmar Burmese
|
|
|
|
|
|
Lalitapur Nepal Nepali
|
|
|
|
|
|
León Nicaragua Spanish
|
|
|
|
|
|
Lambaré Paraguay Spanish
|
|
|
|
|
|
Lima Peru Spanish
|
|
|
|
|
|
Lisboa Portugal Portuguese
|
|
|
|
|
|
Lódz Poland Polish
|
|
|
|
|
|
Lublin Poland Polish
|
|
|
|
|
|
Legnica Poland Polish
|
|
|
|
|
|
Lyon France French
|
|
|
|
|
|
Le Havre France French
|
|
|
|
|
|
Lille France French
|
|
|
|
|
|
Le Mans France French
|
|
|
|
|
|
Limoges France French
|
|
|
|
|
|
Linköping Sweden Swedish
|
|
|
|
|
|
Lund Sweden Swedish
|
|
|
|
|
|
Leipzig Germany German
|
|
|
|
|
|
Lübeck Germany German
|
|
|
|
|
|
Ludwigshafen am Rhein Germany German
|
|
|
|
|
|
Leverkusen Germany German
|
|
|
|
|
|
Lünen Germany German
|
|
|
|
|
|
Lahti Finland Finnish
|
|
|
|
|
|
Lausanne Switzerland German
|
|
|
|
|
|
Latakia Syria Arabic
|
|
|
|
|
|
Luchou Taiwan Min
|
|
|
|
|
|
Lungtan Taiwan Min
|
|
|
|
|
|
Liberec Czech Republic Czech
|
|
|
|
|
|
Lviv Ukraine Ukrainian
|
|
|
|
|
|
Lugansk Ukraine Ukrainian
|
|
|
|
|
|
Lutsk Ukraine Ukrainian
|
|
|
|
|
|
Lysyt?ansk Ukraine Ukrainian
|
|
|
|
|
|
Lower Hutt New Zealand English
|
|
|
|
|
|
Lida Belarus Belorussian
|
|
|
|
|
|
Los Teques Venezuela Spanish
|
|
|
|
|
|
Lipetsk Russian Federation Russian
|
|
|
|
|
|
Ljubertsy Russian Federation Russian
|
|
|
|
|
|
Leninsk-Kuznetski Russian Federation Russian
|
|
|
|
|
|
Long Xuyen Vietnam Vietnamese
|
|
|
|
|
|
Los Angeles United States English
|
|
|
|
|
|
Las Vegas United States English
|
|
|
|
|
|
Long Beach United States English
|
|
|
|
|
|
Lexington-Fayette United States English
|
|
|
|
|
|
Louisville United States English
|
|
|
|
|
|
Lincoln United States English
|
|
|
|
|
|
Lubbock United States English
|
|
|
|
|
|
Little Rock United States English
|
|
|
|
|
|
Laredo United States English
|
|
|
|
|
|
Lakewood United States English
|
|
|
|
|
|
Lansing United States English
|
|
|
|
|
|
Lancaster United States English
|
|
|
|
|
|
Lafayette United States English
|
|
|
|
|
|
Lowell United States English
|
|
|
|
|
|
Livonia United States English
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
Name
|
|
|
|
|
|
Vientiane
|
|
|
|
|
|
Riga
|
|
|
|
|
|
Daugavpils
|
|
|
|
|
|
Maseru
|
|
|
|
|
|
Beirut
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Monrovia
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Bengasi
|
|
|
|
|
|
Misrata
|
|
|
|
|
|
Vilnius
|
|
|
|
|
|
Kaunas
|
|
|
|
|
|
Klaipeda
|
|
|
|
|
|
?iauliai
|
|
|
|
|
|
Panevezys
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
FROM Country LEFT JOIN CountryLanguage ON
|
|
|
|
|
|
(CountryLanguage.Country=Country.Code AND Language='English')
|
|
|
|
|
|
WHERE
|
|
|
|
|
|
Country.Population > 10000000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
|
|
|
|
|
1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer
|
|
|
|
|
|
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
FROM Country LEFT JOIN CountryLanguage ON
|
|
|
|
|
|
(CountryLanguage.Country=Country.Code AND Language='English')
|
|
|
|
|
|
WHERE
|
|
|
|
|
|
Country.Population > 10000000;
|
|
|
|
|
|
Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
Australia 81.2
|
|
|
|
|
|
United Kingdom 97.3
|
|
|
|
|
|
Canada 60.4
|
|
|
|
|
|
United States 86.2
|
|
|
|
|
|
Zimbabwe 2.2
|
|
|
|
|
|
Japan 0.1
|
|
|
|
|
|
South Africa 8.5
|
|
|
|
|
|
Malaysia 1.6
|
|
|
|
|
|
Afghanistan NULL
|
|
|
|
|
|
Netherlands NULL
|
|
|
|
|
|
Algeria NULL
|
|
|
|
|
|
Angola NULL
|
|
|
|
|
|
Argentina NULL
|
|
|
|
|
|
Bangladesh NULL
|
|
|
|
|
|
Belgium NULL
|
|
|
|
|
|
Brazil NULL
|
|
|
|
|
|
Burkina Faso NULL
|
|
|
|
|
|
Chile NULL
|
|
|
|
|
|
Ecuador NULL
|
|
|
|
|
|
Egypt NULL
|
|
|
|
|
|
Spain NULL
|
|
|
|
|
|
Ethiopia NULL
|
|
|
|
|
|
Philippines NULL
|
|
|
|
|
|
Ghana NULL
|
|
|
|
|
|
Guatemala NULL
|
|
|
|
|
|
Indonesia NULL
|
|
|
|
|
|
India NULL
|
|
|
|
|
|
Iraq NULL
|
|
|
|
|
|
Iran NULL
|
|
|
|
|
|
Italy NULL
|
|
|
|
|
|
Yemen NULL
|
|
|
|
|
|
Yugoslavia NULL
|
|
|
|
|
|
Cambodia NULL
|
|
|
|
|
|
Cameroon NULL
|
|
|
|
|
|
Kazakstan NULL
|
|
|
|
|
|
Kenya NULL
|
|
|
|
|
|
China NULL
|
|
|
|
|
|
Colombia NULL
|
|
|
|
|
|
Congo, The Democratic Republic of the NULL
|
|
|
|
|
|
North Korea NULL
|
|
|
|
|
|
South Korea NULL
|
|
|
|
|
|
Greece NULL
|
|
|
|
|
|
Cuba NULL
|
|
|
|
|
|
Madagascar NULL
|
|
|
|
|
|
Malawi NULL
|
|
|
|
|
|
Mali NULL
|
|
|
|
|
|
Morocco NULL
|
|
|
|
|
|
Mexico NULL
|
|
|
|
|
|
Mozambique NULL
|
|
|
|
|
|
Myanmar NULL
|
|
|
|
|
|
Nepal NULL
|
|
|
|
|
|
Niger NULL
|
|
|
|
|
|
Nigeria NULL
|
|
|
|
|
|
Côte d?Ivoire NULL
|
|
|
|
|
|
Pakistan NULL
|
|
|
|
|
|
Peru NULL
|
|
|
|
|
|
Poland NULL
|
|
|
|
|
|
France NULL
|
|
|
|
|
|
Romania NULL
|
|
|
|
|
|
Germany NULL
|
|
|
|
|
|
Saudi Arabia NULL
|
|
|
|
|
|
Somalia NULL
|
|
|
|
|
|
Sri Lanka NULL
|
|
|
|
|
|
Sudan NULL
|
|
|
|
|
|
Syria NULL
|
|
|
|
|
|
Taiwan NULL
|
|
|
|
|
|
Tanzania NULL
|
|
|
|
|
|
Thailand NULL
|
|
|
|
|
|
Czech Republic NULL
|
|
|
|
|
|
Turkey NULL
|
|
|
|
|
|
Uganda NULL
|
|
|
|
|
|
Ukraine NULL
|
|
|
|
|
|
Hungary NULL
|
|
|
|
|
|
Uzbekistan NULL
|
|
|
|
|
|
Belarus NULL
|
|
|
|
|
|
Venezuela NULL
|
|
|
|
|
|
Russian Federation NULL
|
|
|
|
|
|
Vietnam NULL
|
|
|
|
|
|
show variables like 'join_buffer_size';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_buffer_size 131072
|
2009-12-21 03:26:15 +01:00
|
|
|
|
set join_cache_level=5;
|
|
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
2010-08-31 18:34:21 +02:00
|
|
|
|
join_cache_level 5
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where
|
|
|
|
|
|
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE City ref Country Country 3 world.Country.Code 18 Using index condition(BKA); Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
Name Name Language
|
|
|
|
|
|
Leiden Netherlands Dutch
|
|
|
|
|
|
La Matanza Argentina Spanish
|
|
|
|
|
|
Lomas de Zamora Argentina Spanish
|
|
|
|
|
|
La Plata Argentina Spanish
|
|
|
|
|
|
Lanús Argentina Spanish
|
|
|
|
|
|
Las Heras Argentina Spanish
|
|
|
|
|
|
La Rioja Argentina Spanish
|
|
|
|
|
|
Liège Belgium Dutch
|
|
|
|
|
|
La Paz Bolivia Spanish
|
|
|
|
|
|
Londrina Brazil Portuguese
|
|
|
|
|
|
Limeira Brazil Portuguese
|
|
|
|
|
|
Lages Brazil Portuguese
|
|
|
|
|
|
Luziânia Brazil Portuguese
|
|
|
|
|
|
Lauro de Freitas Brazil Portuguese
|
|
|
|
|
|
Linhares Brazil Portuguese
|
|
|
|
|
|
London United Kingdom English
|
|
|
|
|
|
Liverpool United Kingdom English
|
|
|
|
|
|
Leeds United Kingdom English
|
|
|
|
|
|
Leicester United Kingdom English
|
|
|
|
|
|
Luton United Kingdom English
|
|
|
|
|
|
Los Angeles Chile Spanish
|
|
|
|
|
|
La Serena Chile Spanish
|
|
|
|
|
|
La Romana Dominican Republic Spanish
|
|
|
|
|
|
Loja Ecuador Spanish
|
|
|
|
|
|
Luxor Egypt Arabic
|
|
|
|
|
|
Las Palmas de Gran Canaria Spain Spanish
|
|
|
|
|
|
L´Hospitalet de Llobregat Spain Spanish
|
|
|
|
|
|
Leganés Spain Spanish
|
|
|
|
|
|
León Spain Spanish
|
|
|
|
|
|
Logroño Spain Spanish
|
|
|
|
|
|
Lleida (Lérida) Spain Spanish
|
|
|
|
|
|
Le-Cap-Haïtien Haiti Haiti Creole
|
|
|
|
|
|
La Ceiba Honduras Spanish
|
|
|
|
|
|
Livorno Italy Italian
|
|
|
|
|
|
Latina Italy Italian
|
|
|
|
|
|
Lecce Italy Italian
|
|
|
|
|
|
La Spezia Italy Italian
|
|
|
|
|
|
Linz Austria German
|
|
|
|
|
|
London Canada English
|
|
|
|
|
|
Laval Canada English
|
|
|
|
|
|
Longueuil Canada English
|
|
|
|
|
|
Lanzhou China Chinese
|
|
|
|
|
|
Luoyang China Chinese
|
|
|
|
|
|
Liuzhou China Chinese
|
|
|
|
|
|
Liaoyang China Chinese
|
|
|
|
|
|
Liupanshui China Chinese
|
|
|
|
|
|
Liaoyuan China Chinese
|
|
|
|
|
|
Lianyungang China Chinese
|
|
|
|
|
|
Leshan China Chinese
|
|
|
|
|
|
Linyi China Chinese
|
|
|
|
|
|
Luzhou China Chinese
|
|
|
|
|
|
Laiwu China Chinese
|
|
|
|
|
|
Liaocheng China Chinese
|
|
|
|
|
|
Laizhou China Chinese
|
|
|
|
|
|
Linfen China Chinese
|
|
|
|
|
|
Liangcheng China Chinese
|
|
|
|
|
|
Longkou China Chinese
|
|
|
|
|
|
Langfang China Chinese
|
|
|
|
|
|
Liu´an China Chinese
|
|
|
|
|
|
Longjing China Chinese
|
|
|
|
|
|
Lengshuijiang China Chinese
|
|
|
|
|
|
Laiyang China Chinese
|
|
|
|
|
|
Longyan China Chinese
|
|
|
|
|
|
Linhe China Chinese
|
|
|
|
|
|
Leiyang China Chinese
|
|
|
|
|
|
Loudi China Chinese
|
|
|
|
|
|
Luohe China Chinese
|
|
|
|
|
|
Linqing China Chinese
|
|
|
|
|
|
Laohekou China Chinese
|
|
|
|
|
|
Linchuan China Chinese
|
|
|
|
|
|
Lhasa China Chinese
|
|
|
|
|
|
Lianyuan China Chinese
|
|
|
|
|
|
Liyang China Chinese
|
|
|
|
|
|
Liling China Chinese
|
|
|
|
|
|
Linhai China Chinese
|
|
|
|
|
|
Larisa Greece Greek
|
|
|
|
|
|
La Habana Cuba Spanish
|
|
|
|
|
|
Lilongwe Malawi Chichewa
|
|
|
|
|
|
León Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
Lázaro Cárdenas Mexico Spanish
|
|
|
|
|
|
Lagos de Moreno Mexico Spanish
|
|
|
|
|
|
Lerdo Mexico Spanish
|
|
|
|
|
|
Los Cabos Mexico Spanish
|
|
|
|
|
|
Lerma Mexico Spanish
|
|
|
|
|
|
Las Margaritas Mexico Spanish
|
|
|
|
|
|
Lashio (Lasho) Myanmar Burmese
|
|
|
|
|
|
Lalitapur Nepal Nepali
|
|
|
|
|
|
León Nicaragua Spanish
|
|
|
|
|
|
Lambaré Paraguay Spanish
|
|
|
|
|
|
Lima Peru Spanish
|
|
|
|
|
|
Lisboa Portugal Portuguese
|
|
|
|
|
|
Lódz Poland Polish
|
|
|
|
|
|
Lublin Poland Polish
|
|
|
|
|
|
Legnica Poland Polish
|
|
|
|
|
|
Lyon France French
|
|
|
|
|
|
Le Havre France French
|
|
|
|
|
|
Lille France French
|
|
|
|
|
|
Le Mans France French
|
|
|
|
|
|
Limoges France French
|
|
|
|
|
|
Linköping Sweden Swedish
|
|
|
|
|
|
Lund Sweden Swedish
|
|
|
|
|
|
Leipzig Germany German
|
|
|
|
|
|
Lübeck Germany German
|
|
|
|
|
|
Ludwigshafen am Rhein Germany German
|
|
|
|
|
|
Leverkusen Germany German
|
|
|
|
|
|
Lünen Germany German
|
|
|
|
|
|
Lahti Finland Finnish
|
|
|
|
|
|
Lausanne Switzerland German
|
|
|
|
|
|
Latakia Syria Arabic
|
|
|
|
|
|
Luchou Taiwan Min
|
|
|
|
|
|
Lungtan Taiwan Min
|
|
|
|
|
|
Liberec Czech Republic Czech
|
|
|
|
|
|
Lviv Ukraine Ukrainian
|
|
|
|
|
|
Lugansk Ukraine Ukrainian
|
|
|
|
|
|
Lutsk Ukraine Ukrainian
|
|
|
|
|
|
Lysyt?ansk Ukraine Ukrainian
|
|
|
|
|
|
Lower Hutt New Zealand English
|
|
|
|
|
|
Lida Belarus Belorussian
|
|
|
|
|
|
Los Teques Venezuela Spanish
|
|
|
|
|
|
Lipetsk Russian Federation Russian
|
|
|
|
|
|
Ljubertsy Russian Federation Russian
|
|
|
|
|
|
Leninsk-Kuznetski Russian Federation Russian
|
|
|
|
|
|
Long Xuyen Vietnam Vietnamese
|
|
|
|
|
|
Los Angeles United States English
|
|
|
|
|
|
Las Vegas United States English
|
|
|
|
|
|
Long Beach United States English
|
|
|
|
|
|
Lexington-Fayette United States English
|
|
|
|
|
|
Louisville United States English
|
|
|
|
|
|
Lincoln United States English
|
|
|
|
|
|
Lubbock United States English
|
|
|
|
|
|
Little Rock United States English
|
|
|
|
|
|
Laredo United States English
|
|
|
|
|
|
Lakewood United States English
|
|
|
|
|
|
Lansing United States English
|
|
|
|
|
|
Lancaster United States English
|
|
|
|
|
|
Lafayette United States English
|
|
|
|
|
|
Lowell United States English
|
|
|
|
|
|
Livonia United States English
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
Name
|
|
|
|
|
|
Vientiane
|
|
|
|
|
|
Riga
|
|
|
|
|
|
Daugavpils
|
|
|
|
|
|
Maseru
|
|
|
|
|
|
Beirut
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Monrovia
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Bengasi
|
|
|
|
|
|
Misrata
|
|
|
|
|
|
Vilnius
|
|
|
|
|
|
Kaunas
|
|
|
|
|
|
Klaipeda
|
|
|
|
|
|
?iauliai
|
|
|
|
|
|
Panevezys
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
FROM Country LEFT JOIN CountryLanguage ON
|
|
|
|
|
|
(CountryLanguage.Country=Country.Code AND Language='English')
|
|
|
|
|
|
WHERE
|
|
|
|
|
|
Country.Population > 10000000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
|
|
|
|
|
1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer
|
|
|
|
|
|
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
FROM Country LEFT JOIN CountryLanguage ON
|
|
|
|
|
|
(CountryLanguage.Country=Country.Code AND Language='English')
|
|
|
|
|
|
WHERE
|
|
|
|
|
|
Country.Population > 10000000;
|
|
|
|
|
|
Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
Australia 81.2
|
|
|
|
|
|
United Kingdom 97.3
|
|
|
|
|
|
Canada 60.4
|
|
|
|
|
|
United States 86.2
|
|
|
|
|
|
Zimbabwe 2.2
|
|
|
|
|
|
Japan 0.1
|
|
|
|
|
|
South Africa 8.5
|
|
|
|
|
|
Malaysia 1.6
|
|
|
|
|
|
Afghanistan NULL
|
|
|
|
|
|
Netherlands NULL
|
|
|
|
|
|
Algeria NULL
|
|
|
|
|
|
Angola NULL
|
|
|
|
|
|
Argentina NULL
|
|
|
|
|
|
Bangladesh NULL
|
|
|
|
|
|
Belgium NULL
|
|
|
|
|
|
Brazil NULL
|
|
|
|
|
|
Burkina Faso NULL
|
|
|
|
|
|
Chile NULL
|
|
|
|
|
|
Ecuador NULL
|
|
|
|
|
|
Egypt NULL
|
|
|
|
|
|
Spain NULL
|
|
|
|
|
|
Ethiopia NULL
|
|
|
|
|
|
Philippines NULL
|
|
|
|
|
|
Ghana NULL
|
|
|
|
|
|
Guatemala NULL
|
|
|
|
|
|
Indonesia NULL
|
|
|
|
|
|
India NULL
|
|
|
|
|
|
Iraq NULL
|
|
|
|
|
|
Iran NULL
|
|
|
|
|
|
Italy NULL
|
|
|
|
|
|
Yemen NULL
|
|
|
|
|
|
Yugoslavia NULL
|
|
|
|
|
|
Cambodia NULL
|
|
|
|
|
|
Cameroon NULL
|
|
|
|
|
|
Kazakstan NULL
|
|
|
|
|
|
Kenya NULL
|
|
|
|
|
|
China NULL
|
|
|
|
|
|
Colombia NULL
|
|
|
|
|
|
Congo, The Democratic Republic of the NULL
|
|
|
|
|
|
North Korea NULL
|
|
|
|
|
|
South Korea NULL
|
|
|
|
|
|
Greece NULL
|
|
|
|
|
|
Cuba NULL
|
|
|
|
|
|
Madagascar NULL
|
|
|
|
|
|
Malawi NULL
|
|
|
|
|
|
Mali NULL
|
|
|
|
|
|
Morocco NULL
|
|
|
|
|
|
Mexico NULL
|
|
|
|
|
|
Mozambique NULL
|
|
|
|
|
|
Myanmar NULL
|
|
|
|
|
|
Nepal NULL
|
|
|
|
|
|
Niger NULL
|
|
|
|
|
|
Nigeria NULL
|
|
|
|
|
|
Côte d?Ivoire NULL
|
|
|
|
|
|
Pakistan NULL
|
|
|
|
|
|
Peru NULL
|
|
|
|
|
|
Poland NULL
|
|
|
|
|
|
France NULL
|
|
|
|
|
|
Romania NULL
|
|
|
|
|
|
Germany NULL
|
|
|
|
|
|
Saudi Arabia NULL
|
|
|
|
|
|
Somalia NULL
|
|
|
|
|
|
Sri Lanka NULL
|
|
|
|
|
|
Sudan NULL
|
|
|
|
|
|
Syria NULL
|
|
|
|
|
|
Taiwan NULL
|
|
|
|
|
|
Tanzania NULL
|
|
|
|
|
|
Thailand NULL
|
|
|
|
|
|
Czech Republic NULL
|
|
|
|
|
|
Turkey NULL
|
|
|
|
|
|
Uganda NULL
|
|
|
|
|
|
Ukraine NULL
|
|
|
|
|
|
Hungary NULL
|
|
|
|
|
|
Uzbekistan NULL
|
|
|
|
|
|
Belarus NULL
|
|
|
|
|
|
Venezuela NULL
|
|
|
|
|
|
Russian Federation NULL
|
|
|
|
|
|
Vietnam NULL
|
|
|
|
|
|
set join_cache_level=6;
|
|
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_cache_level 6
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where
|
|
|
|
|
|
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE City ref Country Country 3 world.Country.Code 18 Using index condition(BKA); Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
Name Name Language
|
|
|
|
|
|
Leiden Netherlands Dutch
|
|
|
|
|
|
La Matanza Argentina Spanish
|
|
|
|
|
|
Lomas de Zamora Argentina Spanish
|
|
|
|
|
|
La Plata Argentina Spanish
|
|
|
|
|
|
Lanús Argentina Spanish
|
|
|
|
|
|
Las Heras Argentina Spanish
|
|
|
|
|
|
La Rioja Argentina Spanish
|
|
|
|
|
|
Liège Belgium Dutch
|
|
|
|
|
|
La Paz Bolivia Spanish
|
|
|
|
|
|
Londrina Brazil Portuguese
|
|
|
|
|
|
Limeira Brazil Portuguese
|
|
|
|
|
|
Lages Brazil Portuguese
|
|
|
|
|
|
Luziânia Brazil Portuguese
|
|
|
|
|
|
Lauro de Freitas Brazil Portuguese
|
|
|
|
|
|
Linhares Brazil Portuguese
|
|
|
|
|
|
London United Kingdom English
|
|
|
|
|
|
Liverpool United Kingdom English
|
|
|
|
|
|
Leeds United Kingdom English
|
|
|
|
|
|
Leicester United Kingdom English
|
|
|
|
|
|
Luton United Kingdom English
|
|
|
|
|
|
Los Angeles Chile Spanish
|
|
|
|
|
|
La Serena Chile Spanish
|
|
|
|
|
|
La Romana Dominican Republic Spanish
|
|
|
|
|
|
Loja Ecuador Spanish
|
|
|
|
|
|
Luxor Egypt Arabic
|
|
|
|
|
|
Las Palmas de Gran Canaria Spain Spanish
|
|
|
|
|
|
L´Hospitalet de Llobregat Spain Spanish
|
|
|
|
|
|
Leganés Spain Spanish
|
|
|
|
|
|
León Spain Spanish
|
|
|
|
|
|
Logroño Spain Spanish
|
|
|
|
|
|
Lleida (Lérida) Spain Spanish
|
|
|
|
|
|
Le-Cap-Haïtien Haiti Haiti Creole
|
|
|
|
|
|
La Ceiba Honduras Spanish
|
|
|
|
|
|
Livorno Italy Italian
|
|
|
|
|
|
Latina Italy Italian
|
|
|
|
|
|
Lecce Italy Italian
|
|
|
|
|
|
La Spezia Italy Italian
|
|
|
|
|
|
Linz Austria German
|
|
|
|
|
|
London Canada English
|
|
|
|
|
|
Laval Canada English
|
|
|
|
|
|
Longueuil Canada English
|
|
|
|
|
|
Lanzhou China Chinese
|
|
|
|
|
|
Luoyang China Chinese
|
|
|
|
|
|
Liuzhou China Chinese
|
|
|
|
|
|
Liaoyang China Chinese
|
|
|
|
|
|
Liupanshui China Chinese
|
|
|
|
|
|
Liaoyuan China Chinese
|
|
|
|
|
|
Lianyungang China Chinese
|
|
|
|
|
|
Leshan China Chinese
|
|
|
|
|
|
Linyi China Chinese
|
|
|
|
|
|
Luzhou China Chinese
|
|
|
|
|
|
Laiwu China Chinese
|
|
|
|
|
|
Liaocheng China Chinese
|
|
|
|
|
|
Laizhou China Chinese
|
|
|
|
|
|
Linfen China Chinese
|
|
|
|
|
|
Liangcheng China Chinese
|
|
|
|
|
|
Longkou China Chinese
|
|
|
|
|
|
Langfang China Chinese
|
|
|
|
|
|
Liu´an China Chinese
|
|
|
|
|
|
Longjing China Chinese
|
|
|
|
|
|
Lengshuijiang China Chinese
|
|
|
|
|
|
Laiyang China Chinese
|
|
|
|
|
|
Longyan China Chinese
|
|
|
|
|
|
Linhe China Chinese
|
|
|
|
|
|
Leiyang China Chinese
|
|
|
|
|
|
Loudi China Chinese
|
|
|
|
|
|
Luohe China Chinese
|
|
|
|
|
|
Linqing China Chinese
|
|
|
|
|
|
Laohekou China Chinese
|
|
|
|
|
|
Linchuan China Chinese
|
|
|
|
|
|
Lhasa China Chinese
|
|
|
|
|
|
Lianyuan China Chinese
|
|
|
|
|
|
Liyang China Chinese
|
|
|
|
|
|
Liling China Chinese
|
|
|
|
|
|
Linhai China Chinese
|
|
|
|
|
|
Larisa Greece Greek
|
|
|
|
|
|
La Habana Cuba Spanish
|
|
|
|
|
|
Lilongwe Malawi Chichewa
|
|
|
|
|
|
León Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
Lázaro Cárdenas Mexico Spanish
|
|
|
|
|
|
Lagos de Moreno Mexico Spanish
|
|
|
|
|
|
Lerdo Mexico Spanish
|
|
|
|
|
|
Los Cabos Mexico Spanish
|
|
|
|
|
|
Lerma Mexico Spanish
|
|
|
|
|
|
Las Margaritas Mexico Spanish
|
|
|
|
|
|
Lashio (Lasho) Myanmar Burmese
|
|
|
|
|
|
Lalitapur Nepal Nepali
|
|
|
|
|
|
León Nicaragua Spanish
|
|
|
|
|
|
Lambaré Paraguay Spanish
|
|
|
|
|
|
Lima Peru Spanish
|
|
|
|
|
|
Lisboa Portugal Portuguese
|
|
|
|
|
|
Lódz Poland Polish
|
|
|
|
|
|
Lublin Poland Polish
|
|
|
|
|
|
Legnica Poland Polish
|
|
|
|
|
|
Lyon France French
|
|
|
|
|
|
Le Havre France French
|
|
|
|
|
|
Lille France French
|
|
|
|
|
|
Le Mans France French
|
|
|
|
|
|
Limoges France French
|
|
|
|
|
|
Linköping Sweden Swedish
|
|
|
|
|
|
Lund Sweden Swedish
|
|
|
|
|
|
Leipzig Germany German
|
|
|
|
|
|
Lübeck Germany German
|
|
|
|
|
|
Ludwigshafen am Rhein Germany German
|
|
|
|
|
|
Leverkusen Germany German
|
|
|
|
|
|
Lünen Germany German
|
|
|
|
|
|
Lahti Finland Finnish
|
|
|
|
|
|
Lausanne Switzerland German
|
|
|
|
|
|
Latakia Syria Arabic
|
|
|
|
|
|
Luchou Taiwan Min
|
|
|
|
|
|
Lungtan Taiwan Min
|
|
|
|
|
|
Liberec Czech Republic Czech
|
|
|
|
|
|
Lviv Ukraine Ukrainian
|
|
|
|
|
|
Lugansk Ukraine Ukrainian
|
|
|
|
|
|
Lutsk Ukraine Ukrainian
|
|
|
|
|
|
Lysyt?ansk Ukraine Ukrainian
|
|
|
|
|
|
Lower Hutt New Zealand English
|
|
|
|
|
|
Lida Belarus Belorussian
|
|
|
|
|
|
Los Teques Venezuela Spanish
|
|
|
|
|
|
Lipetsk Russian Federation Russian
|
|
|
|
|
|
Ljubertsy Russian Federation Russian
|
|
|
|
|
|
Leninsk-Kuznetski Russian Federation Russian
|
|
|
|
|
|
Long Xuyen Vietnam Vietnamese
|
|
|
|
|
|
Los Angeles United States English
|
|
|
|
|
|
Las Vegas United States English
|
|
|
|
|
|
Long Beach United States English
|
|
|
|
|
|
Lexington-Fayette United States English
|
|
|
|
|
|
Louisville United States English
|
|
|
|
|
|
Lincoln United States English
|
|
|
|
|
|
Lubbock United States English
|
|
|
|
|
|
Little Rock United States English
|
|
|
|
|
|
Laredo United States English
|
|
|
|
|
|
Lakewood United States English
|
|
|
|
|
|
Lansing United States English
|
|
|
|
|
|
Lancaster United States English
|
|
|
|
|
|
Lafayette United States English
|
|
|
|
|
|
Lowell United States English
|
|
|
|
|
|
Livonia United States English
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
Name
|
|
|
|
|
|
Vientiane
|
|
|
|
|
|
Riga
|
|
|
|
|
|
Daugavpils
|
|
|
|
|
|
Maseru
|
|
|
|
|
|
Beirut
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Monrovia
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Bengasi
|
|
|
|
|
|
Misrata
|
|
|
|
|
|
Vilnius
|
|
|
|
|
|
Kaunas
|
|
|
|
|
|
Klaipeda
|
|
|
|
|
|
?iauliai
|
|
|
|
|
|
Panevezys
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
FROM Country LEFT JOIN CountryLanguage ON
|
|
|
|
|
|
(CountryLanguage.Country=Country.Code AND Language='English')
|
|
|
|
|
|
WHERE
|
|
|
|
|
|
Country.Population > 10000000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
|
|
|
|
|
1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer
|
|
|
|
|
|
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
FROM Country LEFT JOIN CountryLanguage ON
|
|
|
|
|
|
(CountryLanguage.Country=Country.Code AND Language='English')
|
|
|
|
|
|
WHERE
|
|
|
|
|
|
Country.Population > 10000000;
|
|
|
|
|
|
Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
Australia 81.2
|
|
|
|
|
|
United Kingdom 97.3
|
|
|
|
|
|
Canada 60.4
|
|
|
|
|
|
United States 86.2
|
|
|
|
|
|
Zimbabwe 2.2
|
|
|
|
|
|
Japan 0.1
|
|
|
|
|
|
South Africa 8.5
|
|
|
|
|
|
Malaysia 1.6
|
|
|
|
|
|
Afghanistan NULL
|
|
|
|
|
|
Netherlands NULL
|
|
|
|
|
|
Algeria NULL
|
|
|
|
|
|
Angola NULL
|
|
|
|
|
|
Argentina NULL
|
|
|
|
|
|
Bangladesh NULL
|
|
|
|
|
|
Belgium NULL
|
|
|
|
|
|
Brazil NULL
|
|
|
|
|
|
Burkina Faso NULL
|
|
|
|
|
|
Chile NULL
|
|
|
|
|
|
Ecuador NULL
|
|
|
|
|
|
Egypt NULL
|
|
|
|
|
|
Spain NULL
|
|
|
|
|
|
Ethiopia NULL
|
|
|
|
|
|
Philippines NULL
|
|
|
|
|
|
Ghana NULL
|
|
|
|
|
|
Guatemala NULL
|
|
|
|
|
|
Indonesia NULL
|
|
|
|
|
|
India NULL
|
|
|
|
|
|
Iraq NULL
|
|
|
|
|
|
Iran NULL
|
|
|
|
|
|
Italy NULL
|
|
|
|
|
|
Yemen NULL
|
|
|
|
|
|
Yugoslavia NULL
|
|
|
|
|
|
Cambodia NULL
|
|
|
|
|
|
Cameroon NULL
|
|
|
|
|
|
Kazakstan NULL
|
|
|
|
|
|
Kenya NULL
|
|
|
|
|
|
China NULL
|
|
|
|
|
|
Colombia NULL
|
|
|
|
|
|
Congo, The Democratic Republic of the NULL
|
|
|
|
|
|
North Korea NULL
|
|
|
|
|
|
South Korea NULL
|
|
|
|
|
|
Greece NULL
|
|
|
|
|
|
Cuba NULL
|
|
|
|
|
|
Madagascar NULL
|
|
|
|
|
|
Malawi NULL
|
|
|
|
|
|
Mali NULL
|
|
|
|
|
|
Morocco NULL
|
|
|
|
|
|
Mexico NULL
|
|
|
|
|
|
Mozambique NULL
|
|
|
|
|
|
Myanmar NULL
|
|
|
|
|
|
Nepal NULL
|
|
|
|
|
|
Niger NULL
|
|
|
|
|
|
Nigeria NULL
|
|
|
|
|
|
Côte d?Ivoire NULL
|
|
|
|
|
|
Pakistan NULL
|
|
|
|
|
|
Peru NULL
|
|
|
|
|
|
Poland NULL
|
|
|
|
|
|
France NULL
|
|
|
|
|
|
Romania NULL
|
|
|
|
|
|
Germany NULL
|
|
|
|
|
|
Saudi Arabia NULL
|
|
|
|
|
|
Somalia NULL
|
|
|
|
|
|
Sri Lanka NULL
|
|
|
|
|
|
Sudan NULL
|
|
|
|
|
|
Syria NULL
|
|
|
|
|
|
Taiwan NULL
|
|
|
|
|
|
Tanzania NULL
|
|
|
|
|
|
Thailand NULL
|
|
|
|
|
|
Czech Republic NULL
|
|
|
|
|
|
Turkey NULL
|
|
|
|
|
|
Uganda NULL
|
|
|
|
|
|
Ukraine NULL
|
|
|
|
|
|
Hungary NULL
|
|
|
|
|
|
Uzbekistan NULL
|
|
|
|
|
|
Belarus NULL
|
|
|
|
|
|
Venezuela NULL
|
|
|
|
|
|
Russian Federation NULL
|
|
|
|
|
|
Vietnam NULL
|
|
|
|
|
|
set join_cache_level=7;
|
|
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_cache_level 7
|
2009-12-21 03:26:15 +01:00
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where
|
|
|
|
|
|
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE City ref Country Country 3 world.Country.Code 18 Using index condition(BKA); Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
Name Name Language
|
|
|
|
|
|
Leiden Netherlands Dutch
|
|
|
|
|
|
La Matanza Argentina Spanish
|
|
|
|
|
|
Lomas de Zamora Argentina Spanish
|
|
|
|
|
|
La Plata Argentina Spanish
|
|
|
|
|
|
Lanús Argentina Spanish
|
|
|
|
|
|
Las Heras Argentina Spanish
|
|
|
|
|
|
La Rioja Argentina Spanish
|
|
|
|
|
|
Liège Belgium Dutch
|
|
|
|
|
|
La Paz Bolivia Spanish
|
|
|
|
|
|
Londrina Brazil Portuguese
|
|
|
|
|
|
Limeira Brazil Portuguese
|
|
|
|
|
|
Lages Brazil Portuguese
|
|
|
|
|
|
Luziânia Brazil Portuguese
|
|
|
|
|
|
Lauro de Freitas Brazil Portuguese
|
|
|
|
|
|
Linhares Brazil Portuguese
|
|
|
|
|
|
London United Kingdom English
|
|
|
|
|
|
Liverpool United Kingdom English
|
|
|
|
|
|
Leeds United Kingdom English
|
|
|
|
|
|
Leicester United Kingdom English
|
|
|
|
|
|
Luton United Kingdom English
|
|
|
|
|
|
Los Angeles Chile Spanish
|
|
|
|
|
|
La Serena Chile Spanish
|
|
|
|
|
|
La Romana Dominican Republic Spanish
|
|
|
|
|
|
Loja Ecuador Spanish
|
|
|
|
|
|
Luxor Egypt Arabic
|
|
|
|
|
|
Las Palmas de Gran Canaria Spain Spanish
|
|
|
|
|
|
L´Hospitalet de Llobregat Spain Spanish
|
|
|
|
|
|
Leganés Spain Spanish
|
|
|
|
|
|
León Spain Spanish
|
|
|
|
|
|
Logroño Spain Spanish
|
|
|
|
|
|
Lleida (Lérida) Spain Spanish
|
|
|
|
|
|
Le-Cap-Haïtien Haiti Haiti Creole
|
|
|
|
|
|
La Ceiba Honduras Spanish
|
|
|
|
|
|
Livorno Italy Italian
|
|
|
|
|
|
Latina Italy Italian
|
|
|
|
|
|
Lecce Italy Italian
|
|
|
|
|
|
La Spezia Italy Italian
|
|
|
|
|
|
Linz Austria German
|
|
|
|
|
|
London Canada English
|
|
|
|
|
|
Laval Canada English
|
|
|
|
|
|
Longueuil Canada English
|
|
|
|
|
|
Lanzhou China Chinese
|
|
|
|
|
|
Luoyang China Chinese
|
|
|
|
|
|
Liuzhou China Chinese
|
|
|
|
|
|
Liaoyang China Chinese
|
|
|
|
|
|
Liupanshui China Chinese
|
|
|
|
|
|
Liaoyuan China Chinese
|
|
|
|
|
|
Lianyungang China Chinese
|
|
|
|
|
|
Leshan China Chinese
|
|
|
|
|
|
Linyi China Chinese
|
|
|
|
|
|
Luzhou China Chinese
|
|
|
|
|
|
Laiwu China Chinese
|
|
|
|
|
|
Liaocheng China Chinese
|
|
|
|
|
|
Laizhou China Chinese
|
|
|
|
|
|
Linfen China Chinese
|
|
|
|
|
|
Liangcheng China Chinese
|
|
|
|
|
|
Longkou China Chinese
|
|
|
|
|
|
Langfang China Chinese
|
|
|
|
|
|
Liu´an China Chinese
|
|
|
|
|
|
Longjing China Chinese
|
|
|
|
|
|
Lengshuijiang China Chinese
|
|
|
|
|
|
Laiyang China Chinese
|
|
|
|
|
|
Longyan China Chinese
|
|
|
|
|
|
Linhe China Chinese
|
|
|
|
|
|
Leiyang China Chinese
|
|
|
|
|
|
Loudi China Chinese
|
|
|
|
|
|
Luohe China Chinese
|
|
|
|
|
|
Linqing China Chinese
|
|
|
|
|
|
Laohekou China Chinese
|
|
|
|
|
|
Linchuan China Chinese
|
|
|
|
|
|
Lhasa China Chinese
|
|
|
|
|
|
Lianyuan China Chinese
|
|
|
|
|
|
Liyang China Chinese
|
|
|
|
|
|
Liling China Chinese
|
|
|
|
|
|
Linhai China Chinese
|
|
|
|
|
|
Larisa Greece Greek
|
|
|
|
|
|
La Habana Cuba Spanish
|
|
|
|
|
|
Lilongwe Malawi Chichewa
|
|
|
|
|
|
León Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
Lázaro Cárdenas Mexico Spanish
|
|
|
|
|
|
Lagos de Moreno Mexico Spanish
|
|
|
|
|
|
Lerdo Mexico Spanish
|
|
|
|
|
|
Los Cabos Mexico Spanish
|
|
|
|
|
|
Lerma Mexico Spanish
|
|
|
|
|
|
Las Margaritas Mexico Spanish
|
|
|
|
|
|
Lashio (Lasho) Myanmar Burmese
|
|
|
|
|
|
Lalitapur Nepal Nepali
|
|
|
|
|
|
León Nicaragua Spanish
|
|
|
|
|
|
Lambaré Paraguay Spanish
|
|
|
|
|
|
Lima Peru Spanish
|
|
|
|
|
|
Lisboa Portugal Portuguese
|
|
|
|
|
|
Lódz Poland Polish
|
|
|
|
|
|
Lublin Poland Polish
|
|
|
|
|
|
Legnica Poland Polish
|
|
|
|
|
|
Lyon France French
|
|
|
|
|
|
Le Havre France French
|
|
|
|
|
|
Lille France French
|
|
|
|
|
|
Le Mans France French
|
|
|
|
|
|
Limoges France French
|
|
|
|
|
|
Linköping Sweden Swedish
|
|
|
|
|
|
Lund Sweden Swedish
|
|
|
|
|
|
Leipzig Germany German
|
|
|
|
|
|
Lübeck Germany German
|
|
|
|
|
|
Ludwigshafen am Rhein Germany German
|
|
|
|
|
|
Leverkusen Germany German
|
|
|
|
|
|
Lünen Germany German
|
|
|
|
|
|
Lahti Finland Finnish
|
|
|
|
|
|
Lausanne Switzerland German
|
|
|
|
|
|
Latakia Syria Arabic
|
|
|
|
|
|
Luchou Taiwan Min
|
|
|
|
|
|
Lungtan Taiwan Min
|
|
|
|
|
|
Liberec Czech Republic Czech
|
|
|
|
|
|
Lviv Ukraine Ukrainian
|
|
|
|
|
|
Lugansk Ukraine Ukrainian
|
|
|
|
|
|
Lutsk Ukraine Ukrainian
|
|
|
|
|
|
Lysyt?ansk Ukraine Ukrainian
|
|
|
|
|
|
Lower Hutt New Zealand English
|
|
|
|
|
|
Lida Belarus Belorussian
|
|
|
|
|
|
Los Teques Venezuela Spanish
|
|
|
|
|
|
Lipetsk Russian Federation Russian
|
|
|
|
|
|
Ljubertsy Russian Federation Russian
|
|
|
|
|
|
Leninsk-Kuznetski Russian Federation Russian
|
|
|
|
|
|
Long Xuyen Vietnam Vietnamese
|
|
|
|
|
|
Los Angeles United States English
|
|
|
|
|
|
Las Vegas United States English
|
|
|
|
|
|
Long Beach United States English
|
|
|
|
|
|
Lexington-Fayette United States English
|
|
|
|
|
|
Louisville United States English
|
|
|
|
|
|
Lincoln United States English
|
|
|
|
|
|
Lubbock United States English
|
|
|
|
|
|
Little Rock United States English
|
|
|
|
|
|
Laredo United States English
|
|
|
|
|
|
Lakewood United States English
|
|
|
|
|
|
Lansing United States English
|
|
|
|
|
|
Lancaster United States English
|
|
|
|
|
|
Lafayette United States English
|
|
|
|
|
|
Lowell United States English
|
|
|
|
|
|
Livonia United States English
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
2010-02-11 22:59:32 +01:00
|
|
|
|
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
2009-12-21 03:26:15 +01:00
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
Name
|
|
|
|
|
|
Vientiane
|
|
|
|
|
|
Riga
|
|
|
|
|
|
Daugavpils
|
|
|
|
|
|
Maseru
|
|
|
|
|
|
Beirut
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Monrovia
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Bengasi
|
|
|
|
|
|
Misrata
|
|
|
|
|
|
Vilnius
|
|
|
|
|
|
Kaunas
|
|
|
|
|
|
Klaipeda
|
|
|
|
|
|
?iauliai
|
|
|
|
|
|
Panevezys
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
FROM Country LEFT JOIN CountryLanguage ON
|
|
|
|
|
|
(CountryLanguage.Country=Country.Code AND Language='English')
|
|
|
|
|
|
WHERE
|
|
|
|
|
|
Country.Population > 10000000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
|
|
|
|
|
1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer
|
|
|
|
|
|
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
FROM Country LEFT JOIN CountryLanguage ON
|
|
|
|
|
|
(CountryLanguage.Country=Country.Code AND Language='English')
|
|
|
|
|
|
WHERE
|
|
|
|
|
|
Country.Population > 10000000;
|
|
|
|
|
|
Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
Australia 81.2
|
|
|
|
|
|
United Kingdom 97.3
|
|
|
|
|
|
Canada 60.4
|
|
|
|
|
|
United States 86.2
|
|
|
|
|
|
Zimbabwe 2.2
|
|
|
|
|
|
Japan 0.1
|
|
|
|
|
|
South Africa 8.5
|
|
|
|
|
|
Malaysia 1.6
|
|
|
|
|
|
Afghanistan NULL
|
|
|
|
|
|
Netherlands NULL
|
|
|
|
|
|
Algeria NULL
|
|
|
|
|
|
Angola NULL
|
|
|
|
|
|
Argentina NULL
|
|
|
|
|
|
Bangladesh NULL
|
|
|
|
|
|
Belgium NULL
|
|
|
|
|
|
Brazil NULL
|
|
|
|
|
|
Burkina Faso NULL
|
|
|
|
|
|
Chile NULL
|
|
|
|
|
|
Ecuador NULL
|
|
|
|
|
|
Egypt NULL
|
|
|
|
|
|
Spain NULL
|
|
|
|
|
|
Ethiopia NULL
|
|
|
|
|
|
Philippines NULL
|
|
|
|
|
|
Ghana NULL
|
|
|
|
|
|
Guatemala NULL
|
|
|
|
|
|
Indonesia NULL
|
|
|
|
|
|
India NULL
|
|
|
|
|
|
Iraq NULL
|
|
|
|
|
|
Iran NULL
|
|
|
|
|
|
Italy NULL
|
|
|
|
|
|
Yemen NULL
|
|
|
|
|
|
Yugoslavia NULL
|
|
|
|
|
|
Cambodia NULL
|
|
|
|
|
|
Cameroon NULL
|
|
|
|
|
|
Kazakstan NULL
|
|
|
|
|
|
Kenya NULL
|
|
|
|
|
|
China NULL
|
|
|
|
|
|
Colombia NULL
|
|
|
|
|
|
Congo, The Democratic Republic of the NULL
|
|
|
|
|
|
North Korea NULL
|
|
|
|
|
|
South Korea NULL
|
|
|
|
|
|
Greece NULL
|
|
|
|
|
|
Cuba NULL
|
|
|
|
|
|
Madagascar NULL
|
|
|
|
|
|
Malawi NULL
|
|
|
|
|
|
Mali NULL
|
|
|
|
|
|
Morocco NULL
|
|
|
|
|
|
Mexico NULL
|
|
|
|
|
|
Mozambique NULL
|
|
|
|
|
|
Myanmar NULL
|
|
|
|
|
|
Nepal NULL
|
|
|
|
|
|
Niger NULL
|
|
|
|
|
|
Nigeria NULL
|
|
|
|
|
|
Côte d?Ivoire NULL
|
|
|
|
|
|
Pakistan NULL
|
|
|
|
|
|
Peru NULL
|
|
|
|
|
|
Poland NULL
|
|
|
|
|
|
France NULL
|
|
|
|
|
|
Romania NULL
|
|
|
|
|
|
Germany NULL
|
|
|
|
|
|
Saudi Arabia NULL
|
|
|
|
|
|
Somalia NULL
|
|
|
|
|
|
Sri Lanka NULL
|
|
|
|
|
|
Sudan NULL
|
|
|
|
|
|
Syria NULL
|
|
|
|
|
|
Taiwan NULL
|
|
|
|
|
|
Tanzania NULL
|
|
|
|
|
|
Thailand NULL
|
|
|
|
|
|
Czech Republic NULL
|
|
|
|
|
|
Turkey NULL
|
|
|
|
|
|
Uganda NULL
|
|
|
|
|
|
Ukraine NULL
|
|
|
|
|
|
Hungary NULL
|
|
|
|
|
|
Uzbekistan NULL
|
|
|
|
|
|
Belarus NULL
|
|
|
|
|
|
Venezuela NULL
|
|
|
|
|
|
Russian Federation NULL
|
|
|
|
|
|
Vietnam NULL
|
2010-08-31 18:34:21 +02:00
|
|
|
|
set join_cache_level=8;
|
2009-12-21 03:26:15 +01:00
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
2010-08-31 18:34:21 +02:00
|
|
|
|
join_cache_level 8
|
2009-12-21 03:26:15 +01:00
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where
|
|
|
|
|
|
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE City ref Country Country 3 world.Country.Code 18 Using index condition(BKA); Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
Name Name Language
|
|
|
|
|
|
Leiden Netherlands Dutch
|
|
|
|
|
|
La Matanza Argentina Spanish
|
|
|
|
|
|
Lomas de Zamora Argentina Spanish
|
|
|
|
|
|
La Plata Argentina Spanish
|
|
|
|
|
|
Lanús Argentina Spanish
|
|
|
|
|
|
Las Heras Argentina Spanish
|
|
|
|
|
|
La Rioja Argentina Spanish
|
|
|
|
|
|
Liège Belgium Dutch
|
|
|
|
|
|
La Paz Bolivia Spanish
|
|
|
|
|
|
Londrina Brazil Portuguese
|
|
|
|
|
|
Limeira Brazil Portuguese
|
|
|
|
|
|
Lages Brazil Portuguese
|
|
|
|
|
|
Luziânia Brazil Portuguese
|
|
|
|
|
|
Lauro de Freitas Brazil Portuguese
|
|
|
|
|
|
Linhares Brazil Portuguese
|
|
|
|
|
|
London United Kingdom English
|
|
|
|
|
|
Liverpool United Kingdom English
|
|
|
|
|
|
Leeds United Kingdom English
|
|
|
|
|
|
Leicester United Kingdom English
|
|
|
|
|
|
Luton United Kingdom English
|
|
|
|
|
|
Los Angeles Chile Spanish
|
|
|
|
|
|
La Serena Chile Spanish
|
|
|
|
|
|
La Romana Dominican Republic Spanish
|
|
|
|
|
|
Loja Ecuador Spanish
|
|
|
|
|
|
Luxor Egypt Arabic
|
|
|
|
|
|
Las Palmas de Gran Canaria Spain Spanish
|
|
|
|
|
|
L´Hospitalet de Llobregat Spain Spanish
|
|
|
|
|
|
Leganés Spain Spanish
|
|
|
|
|
|
León Spain Spanish
|
|
|
|
|
|
Logroño Spain Spanish
|
|
|
|
|
|
Lleida (Lérida) Spain Spanish
|
|
|
|
|
|
Le-Cap-Haïtien Haiti Haiti Creole
|
|
|
|
|
|
La Ceiba Honduras Spanish
|
|
|
|
|
|
Livorno Italy Italian
|
|
|
|
|
|
Latina Italy Italian
|
|
|
|
|
|
Lecce Italy Italian
|
|
|
|
|
|
La Spezia Italy Italian
|
|
|
|
|
|
Linz Austria German
|
|
|
|
|
|
London Canada English
|
|
|
|
|
|
Laval Canada English
|
|
|
|
|
|
Longueuil Canada English
|
|
|
|
|
|
Lanzhou China Chinese
|
|
|
|
|
|
Luoyang China Chinese
|
|
|
|
|
|
Liuzhou China Chinese
|
|
|
|
|
|
Liaoyang China Chinese
|
|
|
|
|
|
Liupanshui China Chinese
|
|
|
|
|
|
Liaoyuan China Chinese
|
|
|
|
|
|
Lianyungang China Chinese
|
|
|
|
|
|
Leshan China Chinese
|
|
|
|
|
|
Linyi China Chinese
|
|
|
|
|
|
Luzhou China Chinese
|
|
|
|
|
|
Laiwu China Chinese
|
|
|
|
|
|
Liaocheng China Chinese
|
|
|
|
|
|
Laizhou China Chinese
|
|
|
|
|
|
Linfen China Chinese
|
|
|
|
|
|
Liangcheng China Chinese
|
|
|
|
|
|
Longkou China Chinese
|
|
|
|
|
|
Langfang China Chinese
|
|
|
|
|
|
Liu´an China Chinese
|
|
|
|
|
|
Longjing China Chinese
|
|
|
|
|
|
Lengshuijiang China Chinese
|
|
|
|
|
|
Laiyang China Chinese
|
|
|
|
|
|
Longyan China Chinese
|
|
|
|
|
|
Linhe China Chinese
|
|
|
|
|
|
Leiyang China Chinese
|
|
|
|
|
|
Loudi China Chinese
|
|
|
|
|
|
Luohe China Chinese
|
|
|
|
|
|
Linqing China Chinese
|
|
|
|
|
|
Laohekou China Chinese
|
|
|
|
|
|
Linchuan China Chinese
|
|
|
|
|
|
Lhasa China Chinese
|
|
|
|
|
|
Lianyuan China Chinese
|
|
|
|
|
|
Liyang China Chinese
|
|
|
|
|
|
Liling China Chinese
|
|
|
|
|
|
Linhai China Chinese
|
|
|
|
|
|
Larisa Greece Greek
|
|
|
|
|
|
La Habana Cuba Spanish
|
|
|
|
|
|
Lilongwe Malawi Chichewa
|
|
|
|
|
|
León Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
Lázaro Cárdenas Mexico Spanish
|
|
|
|
|
|
Lagos de Moreno Mexico Spanish
|
|
|
|
|
|
Lerdo Mexico Spanish
|
|
|
|
|
|
Los Cabos Mexico Spanish
|
|
|
|
|
|
Lerma Mexico Spanish
|
|
|
|
|
|
Las Margaritas Mexico Spanish
|
|
|
|
|
|
Lashio (Lasho) Myanmar Burmese
|
|
|
|
|
|
Lalitapur Nepal Nepali
|
|
|
|
|
|
León Nicaragua Spanish
|
|
|
|
|
|
Lambaré Paraguay Spanish
|
|
|
|
|
|
Lima Peru Spanish
|
|
|
|
|
|
Lisboa Portugal Portuguese
|
|
|
|
|
|
Lódz Poland Polish
|
|
|
|
|
|
Lublin Poland Polish
|
|
|
|
|
|
Legnica Poland Polish
|
|
|
|
|
|
Lyon France French
|
|
|
|
|
|
Le Havre France French
|
|
|
|
|
|
Lille France French
|
|
|
|
|
|
Le Mans France French
|
|
|
|
|
|
Limoges France French
|
|
|
|
|
|
Linköping Sweden Swedish
|
|
|
|
|
|
Lund Sweden Swedish
|
|
|
|
|
|
Leipzig Germany German
|
|
|
|
|
|
Lübeck Germany German
|
|
|
|
|
|
Ludwigshafen am Rhein Germany German
|
|
|
|
|
|
Leverkusen Germany German
|
|
|
|
|
|
Lünen Germany German
|
|
|
|
|
|
Lahti Finland Finnish
|
|
|
|
|
|
Lausanne Switzerland German
|
|
|
|
|
|
Latakia Syria Arabic
|
|
|
|
|
|
Luchou Taiwan Min
|
|
|
|
|
|
Lungtan Taiwan Min
|
|
|
|
|
|
Liberec Czech Republic Czech
|
|
|
|
|
|
Lviv Ukraine Ukrainian
|
|
|
|
|
|
Lugansk Ukraine Ukrainian
|
|
|
|
|
|
Lutsk Ukraine Ukrainian
|
|
|
|
|
|
Lysyt?ansk Ukraine Ukrainian
|
|
|
|
|
|
Lower Hutt New Zealand English
|
|
|
|
|
|
Lida Belarus Belorussian
|
|
|
|
|
|
Los Teques Venezuela Spanish
|
|
|
|
|
|
Lipetsk Russian Federation Russian
|
|
|
|
|
|
Ljubertsy Russian Federation Russian
|
|
|
|
|
|
Leninsk-Kuznetski Russian Federation Russian
|
|
|
|
|
|
Long Xuyen Vietnam Vietnamese
|
|
|
|
|
|
Los Angeles United States English
|
|
|
|
|
|
Las Vegas United States English
|
|
|
|
|
|
Long Beach United States English
|
|
|
|
|
|
Lexington-Fayette United States English
|
|
|
|
|
|
Louisville United States English
|
|
|
|
|
|
Lincoln United States English
|
|
|
|
|
|
Lubbock United States English
|
|
|
|
|
|
Little Rock United States English
|
|
|
|
|
|
Laredo United States English
|
|
|
|
|
|
Lakewood United States English
|
|
|
|
|
|
Lansing United States English
|
|
|
|
|
|
Lancaster United States English
|
|
|
|
|
|
Lafayette United States English
|
|
|
|
|
|
Lowell United States English
|
|
|
|
|
|
Livonia United States English
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
2010-02-11 22:59:32 +01:00
|
|
|
|
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
2009-12-21 03:26:15 +01:00
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
Name
|
|
|
|
|
|
Vientiane
|
|
|
|
|
|
Riga
|
|
|
|
|
|
Daugavpils
|
|
|
|
|
|
Maseru
|
|
|
|
|
|
Beirut
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Monrovia
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Bengasi
|
|
|
|
|
|
Misrata
|
|
|
|
|
|
Vilnius
|
|
|
|
|
|
Kaunas
|
|
|
|
|
|
Klaipeda
|
|
|
|
|
|
?iauliai
|
|
|
|
|
|
Panevezys
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
FROM Country LEFT JOIN CountryLanguage ON
|
|
|
|
|
|
(CountryLanguage.Country=Country.Code AND Language='English')
|
|
|
|
|
|
WHERE
|
|
|
|
|
|
Country.Population > 10000000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
|
|
|
|
|
|
1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer
|
|
|
|
|
|
SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
FROM Country LEFT JOIN CountryLanguage ON
|
|
|
|
|
|
(CountryLanguage.Country=Country.Code AND Language='English')
|
|
|
|
|
|
WHERE
|
|
|
|
|
|
Country.Population > 10000000;
|
|
|
|
|
|
Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
|
|
|
|
|
|
Australia 81.2
|
|
|
|
|
|
United Kingdom 97.3
|
|
|
|
|
|
Canada 60.4
|
|
|
|
|
|
United States 86.2
|
|
|
|
|
|
Zimbabwe 2.2
|
|
|
|
|
|
Japan 0.1
|
|
|
|
|
|
South Africa 8.5
|
|
|
|
|
|
Malaysia 1.6
|
|
|
|
|
|
Afghanistan NULL
|
|
|
|
|
|
Netherlands NULL
|
|
|
|
|
|
Algeria NULL
|
|
|
|
|
|
Angola NULL
|
|
|
|
|
|
Argentina NULL
|
|
|
|
|
|
Bangladesh NULL
|
|
|
|
|
|
Belgium NULL
|
|
|
|
|
|
Brazil NULL
|
|
|
|
|
|
Burkina Faso NULL
|
|
|
|
|
|
Chile NULL
|
|
|
|
|
|
Ecuador NULL
|
|
|
|
|
|
Egypt NULL
|
|
|
|
|
|
Spain NULL
|
|
|
|
|
|
Ethiopia NULL
|
|
|
|
|
|
Philippines NULL
|
|
|
|
|
|
Ghana NULL
|
|
|
|
|
|
Guatemala NULL
|
|
|
|
|
|
Indonesia NULL
|
|
|
|
|
|
India NULL
|
|
|
|
|
|
Iraq NULL
|
|
|
|
|
|
Iran NULL
|
|
|
|
|
|
Italy NULL
|
|
|
|
|
|
Yemen NULL
|
|
|
|
|
|
Yugoslavia NULL
|
|
|
|
|
|
Cambodia NULL
|
|
|
|
|
|
Cameroon NULL
|
|
|
|
|
|
Kazakstan NULL
|
|
|
|
|
|
Kenya NULL
|
|
|
|
|
|
China NULL
|
|
|
|
|
|
Colombia NULL
|
|
|
|
|
|
Congo, The Democratic Republic of the NULL
|
|
|
|
|
|
North Korea NULL
|
|
|
|
|
|
South Korea NULL
|
|
|
|
|
|
Greece NULL
|
|
|
|
|
|
Cuba NULL
|
|
|
|
|
|
Madagascar NULL
|
|
|
|
|
|
Malawi NULL
|
|
|
|
|
|
Mali NULL
|
|
|
|
|
|
Morocco NULL
|
|
|
|
|
|
Mexico NULL
|
|
|
|
|
|
Mozambique NULL
|
|
|
|
|
|
Myanmar NULL
|
|
|
|
|
|
Nepal NULL
|
|
|
|
|
|
Niger NULL
|
|
|
|
|
|
Nigeria NULL
|
|
|
|
|
|
Côte d?Ivoire NULL
|
|
|
|
|
|
Pakistan NULL
|
|
|
|
|
|
Peru NULL
|
|
|
|
|
|
Poland NULL
|
|
|
|
|
|
France NULL
|
|
|
|
|
|
Romania NULL
|
|
|
|
|
|
Germany NULL
|
|
|
|
|
|
Saudi Arabia NULL
|
|
|
|
|
|
Somalia NULL
|
|
|
|
|
|
Sri Lanka NULL
|
|
|
|
|
|
Sudan NULL
|
|
|
|
|
|
Syria NULL
|
|
|
|
|
|
Taiwan NULL
|
|
|
|
|
|
Tanzania NULL
|
|
|
|
|
|
Thailand NULL
|
|
|
|
|
|
Czech Republic NULL
|
|
|
|
|
|
Turkey NULL
|
|
|
|
|
|
Uganda NULL
|
|
|
|
|
|
Ukraine NULL
|
|
|
|
|
|
Hungary NULL
|
|
|
|
|
|
Uzbekistan NULL
|
|
|
|
|
|
Belarus NULL
|
|
|
|
|
|
Venezuela NULL
|
|
|
|
|
|
Russian Federation NULL
|
|
|
|
|
|
Vietnam NULL
|
2010-08-31 18:34:21 +02:00
|
|
|
|
set join_buffer_size=256;
|
|
|
|
|
|
show variables like 'join_buffer_size';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_buffer_size 256
|
|
|
|
|
|
set join_cache_level=3;
|
2009-12-21 03:26:15 +01:00
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
2010-08-31 18:34:21 +02:00
|
|
|
|
join_cache_level 3
|
2009-12-21 03:26:15 +01:00
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where
|
|
|
|
|
|
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer
|
2010-08-31 18:34:21 +02:00
|
|
|
|
1 SIMPLE City ref Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
2009-12-21 03:26:15 +01:00
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
Name Name Language
|
|
|
|
|
|
Leiden Netherlands Dutch
|
|
|
|
|
|
La Matanza Argentina Spanish
|
|
|
|
|
|
Lomas de Zamora Argentina Spanish
|
|
|
|
|
|
La Plata Argentina Spanish
|
|
|
|
|
|
Lanús Argentina Spanish
|
|
|
|
|
|
Las Heras Argentina Spanish
|
|
|
|
|
|
La Rioja Argentina Spanish
|
|
|
|
|
|
Liège Belgium Dutch
|
|
|
|
|
|
La Paz Bolivia Spanish
|
|
|
|
|
|
Londrina Brazil Portuguese
|
|
|
|
|
|
Limeira Brazil Portuguese
|
|
|
|
|
|
Lages Brazil Portuguese
|
|
|
|
|
|
Luziânia Brazil Portuguese
|
|
|
|
|
|
Lauro de Freitas Brazil Portuguese
|
|
|
|
|
|
Linhares Brazil Portuguese
|
|
|
|
|
|
London United Kingdom English
|
|
|
|
|
|
Liverpool United Kingdom English
|
|
|
|
|
|
Leeds United Kingdom English
|
|
|
|
|
|
Leicester United Kingdom English
|
|
|
|
|
|
Luton United Kingdom English
|
|
|
|
|
|
Los Angeles Chile Spanish
|
|
|
|
|
|
La Serena Chile Spanish
|
|
|
|
|
|
La Romana Dominican Republic Spanish
|
|
|
|
|
|
Loja Ecuador Spanish
|
|
|
|
|
|
Luxor Egypt Arabic
|
|
|
|
|
|
Las Palmas de Gran Canaria Spain Spanish
|
|
|
|
|
|
L´Hospitalet de Llobregat Spain Spanish
|
|
|
|
|
|
Leganés Spain Spanish
|
|
|
|
|
|
León Spain Spanish
|
|
|
|
|
|
Logroño Spain Spanish
|
|
|
|
|
|
Lleida (Lérida) Spain Spanish
|
|
|
|
|
|
Le-Cap-Haïtien Haiti Haiti Creole
|
|
|
|
|
|
La Ceiba Honduras Spanish
|
|
|
|
|
|
Livorno Italy Italian
|
|
|
|
|
|
Latina Italy Italian
|
|
|
|
|
|
Lecce Italy Italian
|
|
|
|
|
|
La Spezia Italy Italian
|
|
|
|
|
|
Linz Austria German
|
|
|
|
|
|
London Canada English
|
|
|
|
|
|
Laval Canada English
|
|
|
|
|
|
Longueuil Canada English
|
|
|
|
|
|
Lanzhou China Chinese
|
|
|
|
|
|
Luoyang China Chinese
|
|
|
|
|
|
Liuzhou China Chinese
|
|
|
|
|
|
Liaoyang China Chinese
|
|
|
|
|
|
Liupanshui China Chinese
|
|
|
|
|
|
Liaoyuan China Chinese
|
|
|
|
|
|
Lianyungang China Chinese
|
|
|
|
|
|
Leshan China Chinese
|
|
|
|
|
|
Linyi China Chinese
|
|
|
|
|
|
Luzhou China Chinese
|
|
|
|
|
|
Laiwu China Chinese
|
|
|
|
|
|
Liaocheng China Chinese
|
|
|
|
|
|
Laizhou China Chinese
|
|
|
|
|
|
Linfen China Chinese
|
|
|
|
|
|
Liangcheng China Chinese
|
|
|
|
|
|
Longkou China Chinese
|
|
|
|
|
|
Langfang China Chinese
|
|
|
|
|
|
Liu´an China Chinese
|
|
|
|
|
|
Longjing China Chinese
|
|
|
|
|
|
Lengshuijiang China Chinese
|
|
|
|
|
|
Laiyang China Chinese
|
|
|
|
|
|
Longyan China Chinese
|
|
|
|
|
|
Linhe China Chinese
|
|
|
|
|
|
Leiyang China Chinese
|
|
|
|
|
|
Loudi China Chinese
|
|
|
|
|
|
Luohe China Chinese
|
|
|
|
|
|
Linqing China Chinese
|
|
|
|
|
|
Laohekou China Chinese
|
|
|
|
|
|
Linchuan China Chinese
|
|
|
|
|
|
Lhasa China Chinese
|
|
|
|
|
|
Lianyuan China Chinese
|
|
|
|
|
|
Liyang China Chinese
|
|
|
|
|
|
Liling China Chinese
|
|
|
|
|
|
Linhai China Chinese
|
|
|
|
|
|
Larisa Greece Greek
|
|
|
|
|
|
La Habana Cuba Spanish
|
|
|
|
|
|
Lilongwe Malawi Chichewa
|
|
|
|
|
|
León Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
Lázaro Cárdenas Mexico Spanish
|
|
|
|
|
|
Lagos de Moreno Mexico Spanish
|
|
|
|
|
|
Lerdo Mexico Spanish
|
|
|
|
|
|
Los Cabos Mexico Spanish
|
|
|
|
|
|
Lerma Mexico Spanish
|
|
|
|
|
|
Las Margaritas Mexico Spanish
|
|
|
|
|
|
Lashio (Lasho) Myanmar Burmese
|
|
|
|
|
|
Lalitapur Nepal Nepali
|
|
|
|
|
|
León Nicaragua Spanish
|
|
|
|
|
|
Lambaré Paraguay Spanish
|
|
|
|
|
|
Lima Peru Spanish
|
|
|
|
|
|
Lisboa Portugal Portuguese
|
|
|
|
|
|
Lódz Poland Polish
|
|
|
|
|
|
Lublin Poland Polish
|
|
|
|
|
|
Legnica Poland Polish
|
|
|
|
|
|
Lyon France French
|
|
|
|
|
|
Le Havre France French
|
|
|
|
|
|
Lille France French
|
|
|
|
|
|
Le Mans France French
|
|
|
|
|
|
Limoges France French
|
|
|
|
|
|
Linköping Sweden Swedish
|
|
|
|
|
|
Lund Sweden Swedish
|
|
|
|
|
|
Leipzig Germany German
|
|
|
|
|
|
Lübeck Germany German
|
|
|
|
|
|
Ludwigshafen am Rhein Germany German
|
|
|
|
|
|
Leverkusen Germany German
|
|
|
|
|
|
Lünen Germany German
|
|
|
|
|
|
Lahti Finland Finnish
|
|
|
|
|
|
Lausanne Switzerland German
|
|
|
|
|
|
Latakia Syria Arabic
|
|
|
|
|
|
Luchou Taiwan Min
|
|
|
|
|
|
Lungtan Taiwan Min
|
|
|
|
|
|
Liberec Czech Republic Czech
|
|
|
|
|
|
Lviv Ukraine Ukrainian
|
|
|
|
|
|
Lugansk Ukraine Ukrainian
|
|
|
|
|
|
Lutsk Ukraine Ukrainian
|
|
|
|
|
|
Lysyt?ansk Ukraine Ukrainian
|
|
|
|
|
|
Lower Hutt New Zealand English
|
|
|
|
|
|
Lida Belarus Belorussian
|
|
|
|
|
|
Los Teques Venezuela Spanish
|
|
|
|
|
|
Lipetsk Russian Federation Russian
|
|
|
|
|
|
Ljubertsy Russian Federation Russian
|
|
|
|
|
|
Leninsk-Kuznetski Russian Federation Russian
|
|
|
|
|
|
Long Xuyen Vietnam Vietnamese
|
|
|
|
|
|
Los Angeles United States English
|
|
|
|
|
|
Las Vegas United States English
|
|
|
|
|
|
Long Beach United States English
|
|
|
|
|
|
Lexington-Fayette United States English
|
|
|
|
|
|
Louisville United States English
|
|
|
|
|
|
Lincoln United States English
|
|
|
|
|
|
Lubbock United States English
|
|
|
|
|
|
Little Rock United States English
|
|
|
|
|
|
Laredo United States English
|
|
|
|
|
|
Lakewood United States English
|
|
|
|
|
|
Lansing United States English
|
|
|
|
|
|
Lancaster United States English
|
|
|
|
|
|
Lafayette United States English
|
|
|
|
|
|
Lowell United States English
|
|
|
|
|
|
Livonia United States English
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
2010-02-11 22:59:32 +01:00
|
|
|
|
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
2009-12-21 03:26:15 +01:00
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
Name
|
|
|
|
|
|
Vientiane
|
|
|
|
|
|
Riga
|
|
|
|
|
|
Daugavpils
|
|
|
|
|
|
Maseru
|
|
|
|
|
|
Beirut
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Monrovia
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Bengasi
|
|
|
|
|
|
Misrata
|
|
|
|
|
|
Vilnius
|
|
|
|
|
|
Kaunas
|
|
|
|
|
|
Klaipeda
|
|
|
|
|
|
?iauliai
|
|
|
|
|
|
Panevezys
|
2010-08-31 18:34:21 +02:00
|
|
|
|
set join_cache_level=4;
|
2009-12-21 03:26:15 +01:00
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
2010-08-31 18:34:21 +02:00
|
|
|
|
join_cache_level 4
|
2009-12-21 03:26:15 +01:00
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where
|
|
|
|
|
|
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer
|
2010-08-31 18:34:21 +02:00
|
|
|
|
1 SIMPLE City ref Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
2009-12-21 03:26:15 +01:00
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
Name Name Language
|
|
|
|
|
|
Leiden Netherlands Dutch
|
|
|
|
|
|
La Matanza Argentina Spanish
|
|
|
|
|
|
Lomas de Zamora Argentina Spanish
|
|
|
|
|
|
La Plata Argentina Spanish
|
|
|
|
|
|
Lanús Argentina Spanish
|
|
|
|
|
|
Las Heras Argentina Spanish
|
|
|
|
|
|
La Rioja Argentina Spanish
|
|
|
|
|
|
Liège Belgium Dutch
|
|
|
|
|
|
La Paz Bolivia Spanish
|
|
|
|
|
|
Londrina Brazil Portuguese
|
|
|
|
|
|
Limeira Brazil Portuguese
|
|
|
|
|
|
Lages Brazil Portuguese
|
|
|
|
|
|
Luziânia Brazil Portuguese
|
|
|
|
|
|
Lauro de Freitas Brazil Portuguese
|
|
|
|
|
|
Linhares Brazil Portuguese
|
|
|
|
|
|
London United Kingdom English
|
|
|
|
|
|
Liverpool United Kingdom English
|
|
|
|
|
|
Leeds United Kingdom English
|
|
|
|
|
|
Leicester United Kingdom English
|
|
|
|
|
|
Luton United Kingdom English
|
|
|
|
|
|
Los Angeles Chile Spanish
|
|
|
|
|
|
La Serena Chile Spanish
|
|
|
|
|
|
La Romana Dominican Republic Spanish
|
|
|
|
|
|
Loja Ecuador Spanish
|
|
|
|
|
|
Luxor Egypt Arabic
|
|
|
|
|
|
Las Palmas de Gran Canaria Spain Spanish
|
|
|
|
|
|
L´Hospitalet de Llobregat Spain Spanish
|
|
|
|
|
|
Leganés Spain Spanish
|
|
|
|
|
|
León Spain Spanish
|
|
|
|
|
|
Logroño Spain Spanish
|
|
|
|
|
|
Lleida (Lérida) Spain Spanish
|
|
|
|
|
|
Le-Cap-Haïtien Haiti Haiti Creole
|
|
|
|
|
|
La Ceiba Honduras Spanish
|
|
|
|
|
|
Livorno Italy Italian
|
|
|
|
|
|
Latina Italy Italian
|
|
|
|
|
|
Lecce Italy Italian
|
|
|
|
|
|
La Spezia Italy Italian
|
|
|
|
|
|
Linz Austria German
|
|
|
|
|
|
London Canada English
|
|
|
|
|
|
Laval Canada English
|
|
|
|
|
|
Longueuil Canada English
|
|
|
|
|
|
Lanzhou China Chinese
|
|
|
|
|
|
Luoyang China Chinese
|
|
|
|
|
|
Liuzhou China Chinese
|
|
|
|
|
|
Liaoyang China Chinese
|
|
|
|
|
|
Liupanshui China Chinese
|
|
|
|
|
|
Liaoyuan China Chinese
|
|
|
|
|
|
Lianyungang China Chinese
|
|
|
|
|
|
Leshan China Chinese
|
|
|
|
|
|
Linyi China Chinese
|
|
|
|
|
|
Luzhou China Chinese
|
|
|
|
|
|
Laiwu China Chinese
|
|
|
|
|
|
Liaocheng China Chinese
|
|
|
|
|
|
Laizhou China Chinese
|
|
|
|
|
|
Linfen China Chinese
|
|
|
|
|
|
Liangcheng China Chinese
|
|
|
|
|
|
Longkou China Chinese
|
|
|
|
|
|
Langfang China Chinese
|
|
|
|
|
|
Liu´an China Chinese
|
|
|
|
|
|
Longjing China Chinese
|
|
|
|
|
|
Lengshuijiang China Chinese
|
|
|
|
|
|
Laiyang China Chinese
|
|
|
|
|
|
Longyan China Chinese
|
|
|
|
|
|
Linhe China Chinese
|
|
|
|
|
|
Leiyang China Chinese
|
|
|
|
|
|
Loudi China Chinese
|
|
|
|
|
|
Luohe China Chinese
|
|
|
|
|
|
Linqing China Chinese
|
|
|
|
|
|
Laohekou China Chinese
|
|
|
|
|
|
Linchuan China Chinese
|
|
|
|
|
|
Lhasa China Chinese
|
|
|
|
|
|
Lianyuan China Chinese
|
|
|
|
|
|
Liyang China Chinese
|
|
|
|
|
|
Liling China Chinese
|
|
|
|
|
|
Linhai China Chinese
|
|
|
|
|
|
Larisa Greece Greek
|
|
|
|
|
|
La Habana Cuba Spanish
|
|
|
|
|
|
Lilongwe Malawi Chichewa
|
|
|
|
|
|
León Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
Lázaro Cárdenas Mexico Spanish
|
|
|
|
|
|
Lagos de Moreno Mexico Spanish
|
|
|
|
|
|
Lerdo Mexico Spanish
|
|
|
|
|
|
Los Cabos Mexico Spanish
|
|
|
|
|
|
Lerma Mexico Spanish
|
|
|
|
|
|
Las Margaritas Mexico Spanish
|
|
|
|
|
|
Lashio (Lasho) Myanmar Burmese
|
|
|
|
|
|
Lalitapur Nepal Nepali
|
|
|
|
|
|
León Nicaragua Spanish
|
|
|
|
|
|
Lambaré Paraguay Spanish
|
|
|
|
|
|
Lima Peru Spanish
|
|
|
|
|
|
Lisboa Portugal Portuguese
|
|
|
|
|
|
Lódz Poland Polish
|
|
|
|
|
|
Lublin Poland Polish
|
|
|
|
|
|
Legnica Poland Polish
|
|
|
|
|
|
Lyon France French
|
|
|
|
|
|
Le Havre France French
|
|
|
|
|
|
Lille France French
|
|
|
|
|
|
Le Mans France French
|
|
|
|
|
|
Limoges France French
|
|
|
|
|
|
Linköping Sweden Swedish
|
|
|
|
|
|
Lund Sweden Swedish
|
|
|
|
|
|
Leipzig Germany German
|
|
|
|
|
|
Lübeck Germany German
|
|
|
|
|
|
Ludwigshafen am Rhein Germany German
|
|
|
|
|
|
Leverkusen Germany German
|
|
|
|
|
|
Lünen Germany German
|
|
|
|
|
|
Lahti Finland Finnish
|
|
|
|
|
|
Lausanne Switzerland German
|
|
|
|
|
|
Latakia Syria Arabic
|
|
|
|
|
|
Luchou Taiwan Min
|
|
|
|
|
|
Lungtan Taiwan Min
|
|
|
|
|
|
Liberec Czech Republic Czech
|
|
|
|
|
|
Lviv Ukraine Ukrainian
|
|
|
|
|
|
Lugansk Ukraine Ukrainian
|
|
|
|
|
|
Lutsk Ukraine Ukrainian
|
|
|
|
|
|
Lysyt?ansk Ukraine Ukrainian
|
|
|
|
|
|
Lower Hutt New Zealand English
|
|
|
|
|
|
Lida Belarus Belorussian
|
|
|
|
|
|
Los Teques Venezuela Spanish
|
|
|
|
|
|
Lipetsk Russian Federation Russian
|
|
|
|
|
|
Ljubertsy Russian Federation Russian
|
|
|
|
|
|
Leninsk-Kuznetski Russian Federation Russian
|
|
|
|
|
|
Long Xuyen Vietnam Vietnamese
|
|
|
|
|
|
Los Angeles United States English
|
|
|
|
|
|
Las Vegas United States English
|
|
|
|
|
|
Long Beach United States English
|
|
|
|
|
|
Lexington-Fayette United States English
|
|
|
|
|
|
Louisville United States English
|
|
|
|
|
|
Lincoln United States English
|
|
|
|
|
|
Lubbock United States English
|
|
|
|
|
|
Little Rock United States English
|
|
|
|
|
|
Laredo United States English
|
|
|
|
|
|
Lakewood United States English
|
|
|
|
|
|
Lansing United States English
|
|
|
|
|
|
Lancaster United States English
|
|
|
|
|
|
Lafayette United States English
|
|
|
|
|
|
Lowell United States English
|
|
|
|
|
|
Livonia United States English
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
2010-02-11 22:59:32 +01:00
|
|
|
|
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
2009-12-21 03:26:15 +01:00
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
Name
|
|
|
|
|
|
Vientiane
|
|
|
|
|
|
Riga
|
|
|
|
|
|
Daugavpils
|
|
|
|
|
|
Maseru
|
|
|
|
|
|
Beirut
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Monrovia
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Bengasi
|
|
|
|
|
|
Misrata
|
|
|
|
|
|
Vilnius
|
|
|
|
|
|
Kaunas
|
|
|
|
|
|
Klaipeda
|
|
|
|
|
|
?iauliai
|
|
|
|
|
|
Panevezys
|
|
|
|
|
|
set join_cache_level=5;
|
|
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_cache_level 5
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where
|
|
|
|
|
|
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE City ref Country Country 3 world.Country.Code 18 Using index condition(BKA); Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
Name Name Language
|
|
|
|
|
|
Leiden Netherlands Dutch
|
|
|
|
|
|
La Matanza Argentina Spanish
|
|
|
|
|
|
Lomas de Zamora Argentina Spanish
|
|
|
|
|
|
La Plata Argentina Spanish
|
|
|
|
|
|
Lanús Argentina Spanish
|
|
|
|
|
|
Las Heras Argentina Spanish
|
|
|
|
|
|
La Rioja Argentina Spanish
|
|
|
|
|
|
Liège Belgium Dutch
|
|
|
|
|
|
La Paz Bolivia Spanish
|
|
|
|
|
|
Londrina Brazil Portuguese
|
|
|
|
|
|
Limeira Brazil Portuguese
|
|
|
|
|
|
Lages Brazil Portuguese
|
|
|
|
|
|
Luziânia Brazil Portuguese
|
|
|
|
|
|
Lauro de Freitas Brazil Portuguese
|
|
|
|
|
|
Linhares Brazil Portuguese
|
|
|
|
|
|
London United Kingdom English
|
|
|
|
|
|
Liverpool United Kingdom English
|
|
|
|
|
|
Leeds United Kingdom English
|
|
|
|
|
|
Leicester United Kingdom English
|
|
|
|
|
|
Luton United Kingdom English
|
|
|
|
|
|
Los Angeles Chile Spanish
|
|
|
|
|
|
La Serena Chile Spanish
|
|
|
|
|
|
La Romana Dominican Republic Spanish
|
|
|
|
|
|
Loja Ecuador Spanish
|
|
|
|
|
|
Luxor Egypt Arabic
|
|
|
|
|
|
Las Palmas de Gran Canaria Spain Spanish
|
|
|
|
|
|
L´Hospitalet de Llobregat Spain Spanish
|
|
|
|
|
|
Leganés Spain Spanish
|
|
|
|
|
|
León Spain Spanish
|
|
|
|
|
|
Logroño Spain Spanish
|
|
|
|
|
|
Lleida (Lérida) Spain Spanish
|
|
|
|
|
|
Le-Cap-Haïtien Haiti Haiti Creole
|
|
|
|
|
|
La Ceiba Honduras Spanish
|
|
|
|
|
|
Livorno Italy Italian
|
|
|
|
|
|
Latina Italy Italian
|
|
|
|
|
|
Lecce Italy Italian
|
|
|
|
|
|
La Spezia Italy Italian
|
|
|
|
|
|
Linz Austria German
|
|
|
|
|
|
London Canada English
|
|
|
|
|
|
Laval Canada English
|
|
|
|
|
|
Longueuil Canada English
|
|
|
|
|
|
Lanzhou China Chinese
|
|
|
|
|
|
Luoyang China Chinese
|
|
|
|
|
|
Liuzhou China Chinese
|
|
|
|
|
|
Liaoyang China Chinese
|
|
|
|
|
|
Liupanshui China Chinese
|
|
|
|
|
|
Liaoyuan China Chinese
|
|
|
|
|
|
Lianyungang China Chinese
|
|
|
|
|
|
Leshan China Chinese
|
|
|
|
|
|
Linyi China Chinese
|
|
|
|
|
|
Luzhou China Chinese
|
|
|
|
|
|
Laiwu China Chinese
|
|
|
|
|
|
Liaocheng China Chinese
|
|
|
|
|
|
Laizhou China Chinese
|
|
|
|
|
|
Linfen China Chinese
|
|
|
|
|
|
Liangcheng China Chinese
|
|
|
|
|
|
Longkou China Chinese
|
|
|
|
|
|
Langfang China Chinese
|
|
|
|
|
|
Liu´an China Chinese
|
|
|
|
|
|
Longjing China Chinese
|
|
|
|
|
|
Lengshuijiang China Chinese
|
|
|
|
|
|
Laiyang China Chinese
|
|
|
|
|
|
Longyan China Chinese
|
|
|
|
|
|
Linhe China Chinese
|
|
|
|
|
|
Leiyang China Chinese
|
|
|
|
|
|
Loudi China Chinese
|
|
|
|
|
|
Luohe China Chinese
|
|
|
|
|
|
Linqing China Chinese
|
|
|
|
|
|
Laohekou China Chinese
|
|
|
|
|
|
Linchuan China Chinese
|
|
|
|
|
|
Lhasa China Chinese
|
|
|
|
|
|
Lianyuan China Chinese
|
|
|
|
|
|
Liyang China Chinese
|
|
|
|
|
|
Liling China Chinese
|
|
|
|
|
|
Linhai China Chinese
|
|
|
|
|
|
Larisa Greece Greek
|
|
|
|
|
|
La Habana Cuba Spanish
|
|
|
|
|
|
Lilongwe Malawi Chichewa
|
|
|
|
|
|
León Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
Lázaro Cárdenas Mexico Spanish
|
|
|
|
|
|
Lagos de Moreno Mexico Spanish
|
|
|
|
|
|
Lerdo Mexico Spanish
|
|
|
|
|
|
Los Cabos Mexico Spanish
|
|
|
|
|
|
Lerma Mexico Spanish
|
|
|
|
|
|
Las Margaritas Mexico Spanish
|
|
|
|
|
|
Lashio (Lasho) Myanmar Burmese
|
|
|
|
|
|
Lalitapur Nepal Nepali
|
|
|
|
|
|
León Nicaragua Spanish
|
|
|
|
|
|
Lambaré Paraguay Spanish
|
|
|
|
|
|
Lima Peru Spanish
|
|
|
|
|
|
Lisboa Portugal Portuguese
|
|
|
|
|
|
Lódz Poland Polish
|
|
|
|
|
|
Lublin Poland Polish
|
|
|
|
|
|
Legnica Poland Polish
|
|
|
|
|
|
Lyon France French
|
|
|
|
|
|
Le Havre France French
|
|
|
|
|
|
Lille France French
|
|
|
|
|
|
Le Mans France French
|
|
|
|
|
|
Limoges France French
|
|
|
|
|
|
Linköping Sweden Swedish
|
|
|
|
|
|
Lund Sweden Swedish
|
|
|
|
|
|
Leipzig Germany German
|
|
|
|
|
|
Lübeck Germany German
|
|
|
|
|
|
Ludwigshafen am Rhein Germany German
|
|
|
|
|
|
Leverkusen Germany German
|
|
|
|
|
|
Lünen Germany German
|
|
|
|
|
|
Lahti Finland Finnish
|
|
|
|
|
|
Lausanne Switzerland German
|
|
|
|
|
|
Latakia Syria Arabic
|
|
|
|
|
|
Luchou Taiwan Min
|
|
|
|
|
|
Lungtan Taiwan Min
|
|
|
|
|
|
Liberec Czech Republic Czech
|
|
|
|
|
|
Lviv Ukraine Ukrainian
|
|
|
|
|
|
Lugansk Ukraine Ukrainian
|
|
|
|
|
|
Lutsk Ukraine Ukrainian
|
|
|
|
|
|
Lysyt?ansk Ukraine Ukrainian
|
|
|
|
|
|
Lower Hutt New Zealand English
|
|
|
|
|
|
Lida Belarus Belorussian
|
|
|
|
|
|
Los Teques Venezuela Spanish
|
|
|
|
|
|
Lipetsk Russian Federation Russian
|
|
|
|
|
|
Ljubertsy Russian Federation Russian
|
|
|
|
|
|
Leninsk-Kuznetski Russian Federation Russian
|
|
|
|
|
|
Long Xuyen Vietnam Vietnamese
|
|
|
|
|
|
Los Angeles United States English
|
|
|
|
|
|
Las Vegas United States English
|
|
|
|
|
|
Long Beach United States English
|
|
|
|
|
|
Lexington-Fayette United States English
|
|
|
|
|
|
Louisville United States English
|
|
|
|
|
|
Lincoln United States English
|
|
|
|
|
|
Lubbock United States English
|
|
|
|
|
|
Little Rock United States English
|
|
|
|
|
|
Laredo United States English
|
|
|
|
|
|
Lakewood United States English
|
|
|
|
|
|
Lansing United States English
|
|
|
|
|
|
Lancaster United States English
|
|
|
|
|
|
Lafayette United States English
|
|
|
|
|
|
Lowell United States English
|
|
|
|
|
|
Livonia United States English
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
2010-02-11 22:59:32 +01:00
|
|
|
|
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
2009-12-21 03:26:15 +01:00
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
Name
|
|
|
|
|
|
Vientiane
|
|
|
|
|
|
Riga
|
|
|
|
|
|
Daugavpils
|
|
|
|
|
|
Maseru
|
|
|
|
|
|
Beirut
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Monrovia
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Bengasi
|
|
|
|
|
|
Misrata
|
|
|
|
|
|
Vilnius
|
|
|
|
|
|
Kaunas
|
|
|
|
|
|
Klaipeda
|
|
|
|
|
|
?iauliai
|
|
|
|
|
|
Panevezys
|
|
|
|
|
|
set join_cache_level=6;
|
|
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_cache_level 6
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where
|
|
|
|
|
|
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE City ref Country Country 3 world.Country.Code 18 Using index condition(BKA); Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
Name Name Language
|
|
|
|
|
|
Leiden Netherlands Dutch
|
|
|
|
|
|
La Matanza Argentina Spanish
|
|
|
|
|
|
Lomas de Zamora Argentina Spanish
|
|
|
|
|
|
La Plata Argentina Spanish
|
|
|
|
|
|
Lanús Argentina Spanish
|
|
|
|
|
|
Las Heras Argentina Spanish
|
|
|
|
|
|
La Rioja Argentina Spanish
|
|
|
|
|
|
Liège Belgium Dutch
|
|
|
|
|
|
La Paz Bolivia Spanish
|
|
|
|
|
|
Londrina Brazil Portuguese
|
|
|
|
|
|
Limeira Brazil Portuguese
|
|
|
|
|
|
Lages Brazil Portuguese
|
|
|
|
|
|
Luziânia Brazil Portuguese
|
|
|
|
|
|
Lauro de Freitas Brazil Portuguese
|
|
|
|
|
|
Linhares Brazil Portuguese
|
|
|
|
|
|
London United Kingdom English
|
|
|
|
|
|
Liverpool United Kingdom English
|
|
|
|
|
|
Leeds United Kingdom English
|
|
|
|
|
|
Leicester United Kingdom English
|
|
|
|
|
|
Luton United Kingdom English
|
|
|
|
|
|
Los Angeles Chile Spanish
|
|
|
|
|
|
La Serena Chile Spanish
|
|
|
|
|
|
La Romana Dominican Republic Spanish
|
|
|
|
|
|
Loja Ecuador Spanish
|
|
|
|
|
|
Luxor Egypt Arabic
|
|
|
|
|
|
Las Palmas de Gran Canaria Spain Spanish
|
|
|
|
|
|
L´Hospitalet de Llobregat Spain Spanish
|
|
|
|
|
|
Leganés Spain Spanish
|
|
|
|
|
|
León Spain Spanish
|
|
|
|
|
|
Logroño Spain Spanish
|
|
|
|
|
|
Lleida (Lérida) Spain Spanish
|
|
|
|
|
|
Le-Cap-Haïtien Haiti Haiti Creole
|
|
|
|
|
|
La Ceiba Honduras Spanish
|
|
|
|
|
|
Livorno Italy Italian
|
|
|
|
|
|
Latina Italy Italian
|
|
|
|
|
|
Lecce Italy Italian
|
|
|
|
|
|
La Spezia Italy Italian
|
|
|
|
|
|
Linz Austria German
|
|
|
|
|
|
London Canada English
|
|
|
|
|
|
Laval Canada English
|
|
|
|
|
|
Longueuil Canada English
|
|
|
|
|
|
Lanzhou China Chinese
|
|
|
|
|
|
Luoyang China Chinese
|
|
|
|
|
|
Liuzhou China Chinese
|
|
|
|
|
|
Liaoyang China Chinese
|
|
|
|
|
|
Liupanshui China Chinese
|
|
|
|
|
|
Liaoyuan China Chinese
|
|
|
|
|
|
Lianyungang China Chinese
|
|
|
|
|
|
Leshan China Chinese
|
|
|
|
|
|
Linyi China Chinese
|
|
|
|
|
|
Luzhou China Chinese
|
|
|
|
|
|
Laiwu China Chinese
|
|
|
|
|
|
Liaocheng China Chinese
|
|
|
|
|
|
Laizhou China Chinese
|
|
|
|
|
|
Linfen China Chinese
|
|
|
|
|
|
Liangcheng China Chinese
|
|
|
|
|
|
Longkou China Chinese
|
|
|
|
|
|
Langfang China Chinese
|
|
|
|
|
|
Liu´an China Chinese
|
|
|
|
|
|
Longjing China Chinese
|
|
|
|
|
|
Lengshuijiang China Chinese
|
|
|
|
|
|
Laiyang China Chinese
|
|
|
|
|
|
Longyan China Chinese
|
|
|
|
|
|
Linhe China Chinese
|
|
|
|
|
|
Leiyang China Chinese
|
|
|
|
|
|
Loudi China Chinese
|
|
|
|
|
|
Luohe China Chinese
|
|
|
|
|
|
Linqing China Chinese
|
|
|
|
|
|
Laohekou China Chinese
|
|
|
|
|
|
Linchuan China Chinese
|
|
|
|
|
|
Lhasa China Chinese
|
|
|
|
|
|
Lianyuan China Chinese
|
|
|
|
|
|
Liyang China Chinese
|
|
|
|
|
|
Liling China Chinese
|
|
|
|
|
|
Linhai China Chinese
|
|
|
|
|
|
Larisa Greece Greek
|
|
|
|
|
|
La Habana Cuba Spanish
|
|
|
|
|
|
Lilongwe Malawi Chichewa
|
|
|
|
|
|
León Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
Lázaro Cárdenas Mexico Spanish
|
|
|
|
|
|
Lagos de Moreno Mexico Spanish
|
|
|
|
|
|
Lerdo Mexico Spanish
|
|
|
|
|
|
Los Cabos Mexico Spanish
|
|
|
|
|
|
Lerma Mexico Spanish
|
|
|
|
|
|
Las Margaritas Mexico Spanish
|
|
|
|
|
|
Lashio (Lasho) Myanmar Burmese
|
|
|
|
|
|
Lalitapur Nepal Nepali
|
|
|
|
|
|
León Nicaragua Spanish
|
|
|
|
|
|
Lambaré Paraguay Spanish
|
|
|
|
|
|
Lima Peru Spanish
|
|
|
|
|
|
Lisboa Portugal Portuguese
|
|
|
|
|
|
Lódz Poland Polish
|
|
|
|
|
|
Lublin Poland Polish
|
|
|
|
|
|
Legnica Poland Polish
|
|
|
|
|
|
Lyon France French
|
|
|
|
|
|
Le Havre France French
|
|
|
|
|
|
Lille France French
|
|
|
|
|
|
Le Mans France French
|
|
|
|
|
|
Limoges France French
|
|
|
|
|
|
Linköping Sweden Swedish
|
|
|
|
|
|
Lund Sweden Swedish
|
|
|
|
|
|
Leipzig Germany German
|
|
|
|
|
|
Lübeck Germany German
|
|
|
|
|
|
Ludwigshafen am Rhein Germany German
|
|
|
|
|
|
Leverkusen Germany German
|
|
|
|
|
|
Lünen Germany German
|
|
|
|
|
|
Lahti Finland Finnish
|
|
|
|
|
|
Lausanne Switzerland German
|
|
|
|
|
|
Latakia Syria Arabic
|
|
|
|
|
|
Luchou Taiwan Min
|
|
|
|
|
|
Lungtan Taiwan Min
|
|
|
|
|
|
Liberec Czech Republic Czech
|
|
|
|
|
|
Lviv Ukraine Ukrainian
|
|
|
|
|
|
Lugansk Ukraine Ukrainian
|
|
|
|
|
|
Lutsk Ukraine Ukrainian
|
|
|
|
|
|
Lysyt?ansk Ukraine Ukrainian
|
|
|
|
|
|
Lower Hutt New Zealand English
|
|
|
|
|
|
Lida Belarus Belorussian
|
|
|
|
|
|
Los Teques Venezuela Spanish
|
|
|
|
|
|
Lipetsk Russian Federation Russian
|
|
|
|
|
|
Ljubertsy Russian Federation Russian
|
|
|
|
|
|
Leninsk-Kuznetski Russian Federation Russian
|
|
|
|
|
|
Long Xuyen Vietnam Vietnamese
|
|
|
|
|
|
Los Angeles United States English
|
|
|
|
|
|
Las Vegas United States English
|
|
|
|
|
|
Long Beach United States English
|
|
|
|
|
|
Lexington-Fayette United States English
|
|
|
|
|
|
Louisville United States English
|
|
|
|
|
|
Lincoln United States English
|
|
|
|
|
|
Lubbock United States English
|
|
|
|
|
|
Little Rock United States English
|
|
|
|
|
|
Laredo United States English
|
|
|
|
|
|
Lakewood United States English
|
|
|
|
|
|
Lansing United States English
|
|
|
|
|
|
Lancaster United States English
|
|
|
|
|
|
Lafayette United States English
|
|
|
|
|
|
Lowell United States English
|
|
|
|
|
|
Livonia United States English
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
2010-02-11 22:59:32 +01:00
|
|
|
|
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
2009-12-21 03:26:15 +01:00
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
Name
|
|
|
|
|
|
Vientiane
|
|
|
|
|
|
Riga
|
|
|
|
|
|
Daugavpils
|
|
|
|
|
|
Maseru
|
|
|
|
|
|
Beirut
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Monrovia
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Bengasi
|
|
|
|
|
|
Misrata
|
|
|
|
|
|
Vilnius
|
|
|
|
|
|
Kaunas
|
|
|
|
|
|
Klaipeda
|
|
|
|
|
|
?iauliai
|
|
|
|
|
|
Panevezys
|
|
|
|
|
|
set join_cache_level=7;
|
|
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_cache_level 7
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where
|
|
|
|
|
|
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE City ref Country Country 3 world.Country.Code 18 Using index condition(BKA); Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
Name Name Language
|
|
|
|
|
|
Leiden Netherlands Dutch
|
|
|
|
|
|
La Matanza Argentina Spanish
|
|
|
|
|
|
Lomas de Zamora Argentina Spanish
|
|
|
|
|
|
La Plata Argentina Spanish
|
|
|
|
|
|
Lanús Argentina Spanish
|
|
|
|
|
|
Las Heras Argentina Spanish
|
|
|
|
|
|
La Rioja Argentina Spanish
|
|
|
|
|
|
Liège Belgium Dutch
|
|
|
|
|
|
La Paz Bolivia Spanish
|
|
|
|
|
|
Londrina Brazil Portuguese
|
|
|
|
|
|
Limeira Brazil Portuguese
|
|
|
|
|
|
Lages Brazil Portuguese
|
|
|
|
|
|
Luziânia Brazil Portuguese
|
|
|
|
|
|
Lauro de Freitas Brazil Portuguese
|
|
|
|
|
|
Linhares Brazil Portuguese
|
|
|
|
|
|
London United Kingdom English
|
|
|
|
|
|
Liverpool United Kingdom English
|
|
|
|
|
|
Leeds United Kingdom English
|
|
|
|
|
|
Leicester United Kingdom English
|
|
|
|
|
|
Luton United Kingdom English
|
|
|
|
|
|
Los Angeles Chile Spanish
|
|
|
|
|
|
La Serena Chile Spanish
|
|
|
|
|
|
La Romana Dominican Republic Spanish
|
|
|
|
|
|
Loja Ecuador Spanish
|
|
|
|
|
|
Luxor Egypt Arabic
|
|
|
|
|
|
Las Palmas de Gran Canaria Spain Spanish
|
|
|
|
|
|
L´Hospitalet de Llobregat Spain Spanish
|
|
|
|
|
|
Leganés Spain Spanish
|
|
|
|
|
|
León Spain Spanish
|
|
|
|
|
|
Logroño Spain Spanish
|
|
|
|
|
|
Lleida (Lérida) Spain Spanish
|
|
|
|
|
|
Le-Cap-Haïtien Haiti Haiti Creole
|
|
|
|
|
|
La Ceiba Honduras Spanish
|
|
|
|
|
|
Livorno Italy Italian
|
|
|
|
|
|
Latina Italy Italian
|
|
|
|
|
|
Lecce Italy Italian
|
|
|
|
|
|
La Spezia Italy Italian
|
|
|
|
|
|
Linz Austria German
|
|
|
|
|
|
London Canada English
|
|
|
|
|
|
Laval Canada English
|
|
|
|
|
|
Longueuil Canada English
|
|
|
|
|
|
Lanzhou China Chinese
|
|
|
|
|
|
Luoyang China Chinese
|
|
|
|
|
|
Liuzhou China Chinese
|
|
|
|
|
|
Liaoyang China Chinese
|
|
|
|
|
|
Liupanshui China Chinese
|
|
|
|
|
|
Liaoyuan China Chinese
|
|
|
|
|
|
Lianyungang China Chinese
|
|
|
|
|
|
Leshan China Chinese
|
|
|
|
|
|
Linyi China Chinese
|
|
|
|
|
|
Luzhou China Chinese
|
|
|
|
|
|
Laiwu China Chinese
|
|
|
|
|
|
Liaocheng China Chinese
|
|
|
|
|
|
Laizhou China Chinese
|
|
|
|
|
|
Linfen China Chinese
|
|
|
|
|
|
Liangcheng China Chinese
|
|
|
|
|
|
Longkou China Chinese
|
|
|
|
|
|
Langfang China Chinese
|
|
|
|
|
|
Liu´an China Chinese
|
|
|
|
|
|
Longjing China Chinese
|
|
|
|
|
|
Lengshuijiang China Chinese
|
|
|
|
|
|
Laiyang China Chinese
|
|
|
|
|
|
Longyan China Chinese
|
|
|
|
|
|
Linhe China Chinese
|
|
|
|
|
|
Leiyang China Chinese
|
|
|
|
|
|
Loudi China Chinese
|
|
|
|
|
|
Luohe China Chinese
|
|
|
|
|
|
Linqing China Chinese
|
|
|
|
|
|
Laohekou China Chinese
|
|
|
|
|
|
Linchuan China Chinese
|
|
|
|
|
|
Lhasa China Chinese
|
|
|
|
|
|
Lianyuan China Chinese
|
|
|
|
|
|
Liyang China Chinese
|
|
|
|
|
|
Liling China Chinese
|
|
|
|
|
|
Linhai China Chinese
|
|
|
|
|
|
Larisa Greece Greek
|
|
|
|
|
|
La Habana Cuba Spanish
|
|
|
|
|
|
Lilongwe Malawi Chichewa
|
|
|
|
|
|
León Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
Lázaro Cárdenas Mexico Spanish
|
|
|
|
|
|
Lagos de Moreno Mexico Spanish
|
|
|
|
|
|
Lerdo Mexico Spanish
|
|
|
|
|
|
Los Cabos Mexico Spanish
|
|
|
|
|
|
Lerma Mexico Spanish
|
|
|
|
|
|
Las Margaritas Mexico Spanish
|
|
|
|
|
|
Lashio (Lasho) Myanmar Burmese
|
|
|
|
|
|
Lalitapur Nepal Nepali
|
|
|
|
|
|
León Nicaragua Spanish
|
|
|
|
|
|
Lambaré Paraguay Spanish
|
|
|
|
|
|
Lima Peru Spanish
|
|
|
|
|
|
Lisboa Portugal Portuguese
|
|
|
|
|
|
Lódz Poland Polish
|
|
|
|
|
|
Lublin Poland Polish
|
|
|
|
|
|
Legnica Poland Polish
|
|
|
|
|
|
Lyon France French
|
|
|
|
|
|
Le Havre France French
|
|
|
|
|
|
Lille France French
|
|
|
|
|
|
Le Mans France French
|
|
|
|
|
|
Limoges France French
|
|
|
|
|
|
Linköping Sweden Swedish
|
|
|
|
|
|
Lund Sweden Swedish
|
|
|
|
|
|
Leipzig Germany German
|
|
|
|
|
|
Lübeck Germany German
|
|
|
|
|
|
Ludwigshafen am Rhein Germany German
|
|
|
|
|
|
Leverkusen Germany German
|
|
|
|
|
|
Lünen Germany German
|
|
|
|
|
|
Lahti Finland Finnish
|
|
|
|
|
|
Lausanne Switzerland German
|
|
|
|
|
|
Latakia Syria Arabic
|
|
|
|
|
|
Luchou Taiwan Min
|
|
|
|
|
|
Lungtan Taiwan Min
|
|
|
|
|
|
Liberec Czech Republic Czech
|
|
|
|
|
|
Lviv Ukraine Ukrainian
|
|
|
|
|
|
Lugansk Ukraine Ukrainian
|
|
|
|
|
|
Lutsk Ukraine Ukrainian
|
|
|
|
|
|
Lysyt?ansk Ukraine Ukrainian
|
|
|
|
|
|
Lower Hutt New Zealand English
|
|
|
|
|
|
Lida Belarus Belorussian
|
|
|
|
|
|
Los Teques Venezuela Spanish
|
|
|
|
|
|
Lipetsk Russian Federation Russian
|
|
|
|
|
|
Ljubertsy Russian Federation Russian
|
|
|
|
|
|
Leninsk-Kuznetski Russian Federation Russian
|
|
|
|
|
|
Long Xuyen Vietnam Vietnamese
|
|
|
|
|
|
Los Angeles United States English
|
|
|
|
|
|
Las Vegas United States English
|
|
|
|
|
|
Long Beach United States English
|
|
|
|
|
|
Lexington-Fayette United States English
|
|
|
|
|
|
Louisville United States English
|
|
|
|
|
|
Lincoln United States English
|
|
|
|
|
|
Lubbock United States English
|
|
|
|
|
|
Little Rock United States English
|
|
|
|
|
|
Laredo United States English
|
|
|
|
|
|
Lakewood United States English
|
|
|
|
|
|
Lansing United States English
|
|
|
|
|
|
Lancaster United States English
|
|
|
|
|
|
Lafayette United States English
|
|
|
|
|
|
Lowell United States English
|
|
|
|
|
|
Livonia United States English
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
2010-02-11 22:59:32 +01:00
|
|
|
|
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
2009-12-21 03:26:15 +01:00
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
Name
|
|
|
|
|
|
Vientiane
|
|
|
|
|
|
Riga
|
|
|
|
|
|
Daugavpils
|
|
|
|
|
|
Maseru
|
|
|
|
|
|
Beirut
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Monrovia
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Bengasi
|
|
|
|
|
|
Misrata
|
|
|
|
|
|
Vilnius
|
|
|
|
|
|
Kaunas
|
|
|
|
|
|
Klaipeda
|
|
|
|
|
|
?iauliai
|
|
|
|
|
|
Panevezys
|
|
|
|
|
|
set join_cache_level=8;
|
|
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_cache_level 8
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 SIMPLE City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE CountryLanguage ALL PRIMARY,Percentage NULL NULL NULL 984 Using where
|
|
|
|
|
|
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.CountryLanguage.Country 1 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE City ref Country Country 3 world.Country.Code 18 Using index condition(BKA); Using where; Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name, CountryLanguage.Language
|
|
|
|
|
|
FROM City,Country,CountryLanguage
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
CountryLanguage.Country=Country.Code AND
|
|
|
|
|
|
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
|
|
|
|
|
|
CountryLanguage.Percentage > 50;
|
|
|
|
|
|
Name Name Language
|
|
|
|
|
|
Leiden Netherlands Dutch
|
|
|
|
|
|
La Matanza Argentina Spanish
|
|
|
|
|
|
Lomas de Zamora Argentina Spanish
|
|
|
|
|
|
La Plata Argentina Spanish
|
|
|
|
|
|
Lanús Argentina Spanish
|
|
|
|
|
|
Las Heras Argentina Spanish
|
|
|
|
|
|
La Rioja Argentina Spanish
|
|
|
|
|
|
Liège Belgium Dutch
|
|
|
|
|
|
La Paz Bolivia Spanish
|
|
|
|
|
|
Londrina Brazil Portuguese
|
|
|
|
|
|
Limeira Brazil Portuguese
|
|
|
|
|
|
Lages Brazil Portuguese
|
|
|
|
|
|
Luziânia Brazil Portuguese
|
|
|
|
|
|
Lauro de Freitas Brazil Portuguese
|
|
|
|
|
|
Linhares Brazil Portuguese
|
|
|
|
|
|
London United Kingdom English
|
|
|
|
|
|
Liverpool United Kingdom English
|
|
|
|
|
|
Leeds United Kingdom English
|
|
|
|
|
|
Leicester United Kingdom English
|
|
|
|
|
|
Luton United Kingdom English
|
|
|
|
|
|
Los Angeles Chile Spanish
|
|
|
|
|
|
La Serena Chile Spanish
|
|
|
|
|
|
La Romana Dominican Republic Spanish
|
|
|
|
|
|
Loja Ecuador Spanish
|
|
|
|
|
|
Luxor Egypt Arabic
|
|
|
|
|
|
Las Palmas de Gran Canaria Spain Spanish
|
|
|
|
|
|
L´Hospitalet de Llobregat Spain Spanish
|
|
|
|
|
|
Leganés Spain Spanish
|
|
|
|
|
|
León Spain Spanish
|
|
|
|
|
|
Logroño Spain Spanish
|
|
|
|
|
|
Lleida (Lérida) Spain Spanish
|
|
|
|
|
|
Le-Cap-Haïtien Haiti Haiti Creole
|
|
|
|
|
|
La Ceiba Honduras Spanish
|
|
|
|
|
|
Livorno Italy Italian
|
|
|
|
|
|
Latina Italy Italian
|
|
|
|
|
|
Lecce Italy Italian
|
|
|
|
|
|
La Spezia Italy Italian
|
|
|
|
|
|
Linz Austria German
|
|
|
|
|
|
London Canada English
|
|
|
|
|
|
Laval Canada English
|
|
|
|
|
|
Longueuil Canada English
|
|
|
|
|
|
Lanzhou China Chinese
|
|
|
|
|
|
Luoyang China Chinese
|
|
|
|
|
|
Liuzhou China Chinese
|
|
|
|
|
|
Liaoyang China Chinese
|
|
|
|
|
|
Liupanshui China Chinese
|
|
|
|
|
|
Liaoyuan China Chinese
|
|
|
|
|
|
Lianyungang China Chinese
|
|
|
|
|
|
Leshan China Chinese
|
|
|
|
|
|
Linyi China Chinese
|
|
|
|
|
|
Luzhou China Chinese
|
|
|
|
|
|
Laiwu China Chinese
|
|
|
|
|
|
Liaocheng China Chinese
|
|
|
|
|
|
Laizhou China Chinese
|
|
|
|
|
|
Linfen China Chinese
|
|
|
|
|
|
Liangcheng China Chinese
|
|
|
|
|
|
Longkou China Chinese
|
|
|
|
|
|
Langfang China Chinese
|
|
|
|
|
|
Liu´an China Chinese
|
|
|
|
|
|
Longjing China Chinese
|
|
|
|
|
|
Lengshuijiang China Chinese
|
|
|
|
|
|
Laiyang China Chinese
|
|
|
|
|
|
Longyan China Chinese
|
|
|
|
|
|
Linhe China Chinese
|
|
|
|
|
|
Leiyang China Chinese
|
|
|
|
|
|
Loudi China Chinese
|
|
|
|
|
|
Luohe China Chinese
|
|
|
|
|
|
Linqing China Chinese
|
|
|
|
|
|
Laohekou China Chinese
|
|
|
|
|
|
Linchuan China Chinese
|
|
|
|
|
|
Lhasa China Chinese
|
|
|
|
|
|
Lianyuan China Chinese
|
|
|
|
|
|
Liyang China Chinese
|
|
|
|
|
|
Liling China Chinese
|
|
|
|
|
|
Linhai China Chinese
|
|
|
|
|
|
Larisa Greece Greek
|
|
|
|
|
|
La Habana Cuba Spanish
|
|
|
|
|
|
Lilongwe Malawi Chichewa
|
|
|
|
|
|
León Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
La Paz Mexico Spanish
|
|
|
|
|
|
Lázaro Cárdenas Mexico Spanish
|
|
|
|
|
|
Lagos de Moreno Mexico Spanish
|
|
|
|
|
|
Lerdo Mexico Spanish
|
|
|
|
|
|
Los Cabos Mexico Spanish
|
|
|
|
|
|
Lerma Mexico Spanish
|
|
|
|
|
|
Las Margaritas Mexico Spanish
|
|
|
|
|
|
Lashio (Lasho) Myanmar Burmese
|
|
|
|
|
|
Lalitapur Nepal Nepali
|
|
|
|
|
|
León Nicaragua Spanish
|
|
|
|
|
|
Lambaré Paraguay Spanish
|
|
|
|
|
|
Lima Peru Spanish
|
|
|
|
|
|
Lisboa Portugal Portuguese
|
|
|
|
|
|
Lódz Poland Polish
|
|
|
|
|
|
Lublin Poland Polish
|
|
|
|
|
|
Legnica Poland Polish
|
|
|
|
|
|
Lyon France French
|
|
|
|
|
|
Le Havre France French
|
|
|
|
|
|
Lille France French
|
|
|
|
|
|
Le Mans France French
|
|
|
|
|
|
Limoges France French
|
|
|
|
|
|
Linköping Sweden Swedish
|
|
|
|
|
|
Lund Sweden Swedish
|
|
|
|
|
|
Leipzig Germany German
|
|
|
|
|
|
Lübeck Germany German
|
|
|
|
|
|
Ludwigshafen am Rhein Germany German
|
|
|
|
|
|
Leverkusen Germany German
|
|
|
|
|
|
Lünen Germany German
|
|
|
|
|
|
Lahti Finland Finnish
|
|
|
|
|
|
Lausanne Switzerland German
|
|
|
|
|
|
Latakia Syria Arabic
|
|
|
|
|
|
Luchou Taiwan Min
|
|
|
|
|
|
Lungtan Taiwan Min
|
|
|
|
|
|
Liberec Czech Republic Czech
|
|
|
|
|
|
Lviv Ukraine Ukrainian
|
|
|
|
|
|
Lugansk Ukraine Ukrainian
|
|
|
|
|
|
Lutsk Ukraine Ukrainian
|
|
|
|
|
|
Lysyt?ansk Ukraine Ukrainian
|
|
|
|
|
|
Lower Hutt New Zealand English
|
|
|
|
|
|
Lida Belarus Belorussian
|
|
|
|
|
|
Los Teques Venezuela Spanish
|
|
|
|
|
|
Lipetsk Russian Federation Russian
|
|
|
|
|
|
Ljubertsy Russian Federation Russian
|
|
|
|
|
|
Leninsk-Kuznetski Russian Federation Russian
|
|
|
|
|
|
Long Xuyen Vietnam Vietnamese
|
|
|
|
|
|
Los Angeles United States English
|
|
|
|
|
|
Las Vegas United States English
|
|
|
|
|
|
Long Beach United States English
|
|
|
|
|
|
Lexington-Fayette United States English
|
|
|
|
|
|
Louisville United States English
|
|
|
|
|
|
Lincoln United States English
|
|
|
|
|
|
Lubbock United States English
|
|
|
|
|
|
Little Rock United States English
|
|
|
|
|
|
Laredo United States English
|
|
|
|
|
|
Lakewood United States English
|
|
|
|
|
|
Lansing United States English
|
|
|
|
|
|
Lancaster United States English
|
|
|
|
|
|
Lafayette United States English
|
|
|
|
|
|
Lowell United States English
|
|
|
|
|
|
Livonia United States English
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
2010-02-11 22:59:32 +01:00
|
|
|
|
1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Using MRR
|
|
|
|
|
|
1 PRIMARY City ref Population,Country Country 3 world.Country.Code 18 Using where; Using join buffer
|
2009-12-21 03:26:15 +01:00
|
|
|
|
SELECT Name FROM City
|
|
|
|
|
|
WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
|
|
|
|
|
|
City.Population > 100000;
|
|
|
|
|
|
Name
|
|
|
|
|
|
Vientiane
|
|
|
|
|
|
Riga
|
|
|
|
|
|
Daugavpils
|
|
|
|
|
|
Maseru
|
|
|
|
|
|
Beirut
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Monrovia
|
|
|
|
|
|
Tripoli
|
|
|
|
|
|
Bengasi
|
|
|
|
|
|
Misrata
|
|
|
|
|
|
Vilnius
|
|
|
|
|
|
Kaunas
|
|
|
|
|
|
Klaipeda
|
|
|
|
|
|
?iauliai
|
|
|
|
|
|
Panevezys
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
set join_buffer_size=default;
|
|
|
|
|
|
show variables like 'join_buffer_size';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_buffer_size 131072
|
|
|
|
|
|
show variables like 'join_cache_level';
|
|
|
|
|
|
Variable_name Value
|
|
|
|
|
|
join_cache_level 1
|
|
|
|
|
|
set join_cache_level=1;
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND City.Population > 3000000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Sydney Australia
|
|
|
|
|
|
Dhaka Bangladesh
|
|
|
|
|
|
São Paulo Brazil
|
|
|
|
|
|
Rio de Janeiro Brazil
|
|
|
|
|
|
London United Kingdom
|
|
|
|
|
|
Santiago de Chile Chile
|
|
|
|
|
|
Cairo Egypt
|
|
|
|
|
|
Alexandria Egypt
|
|
|
|
|
|
Jakarta Indonesia
|
|
|
|
|
|
Mumbai (Bombay) India
|
|
|
|
|
|
Delhi India
|
|
|
|
|
|
Calcutta [Kolkata] India
|
|
|
|
|
|
Chennai (Madras) India
|
|
|
|
|
|
Baghdad Iraq
|
|
|
|
|
|
Teheran Iran
|
|
|
|
|
|
Tokyo Japan
|
|
|
|
|
|
Jokohama [Yokohama] Japan
|
|
|
|
|
|
Shanghai China
|
|
|
|
|
|
Peking China
|
|
|
|
|
|
Chongqing China
|
|
|
|
|
|
Tianjin China
|
|
|
|
|
|
Wuhan China
|
|
|
|
|
|
Harbin China
|
|
|
|
|
|
Shenyang China
|
|
|
|
|
|
Kanton [Guangzhou] China
|
|
|
|
|
|
Chengdu China
|
|
|
|
|
|
Santafé de Bogotá Colombia
|
|
|
|
|
|
Kinshasa Congo, The Democratic Republic of the
|
|
|
|
|
|
Seoul South Korea
|
|
|
|
|
|
Pusan South Korea
|
|
|
|
|
|
Ciudad de México Mexico
|
|
|
|
|
|
Rangoon (Yangon) Myanmar
|
|
|
|
|
|
Karachi Pakistan
|
|
|
|
|
|
Lahore Pakistan
|
|
|
|
|
|
Lima Peru
|
|
|
|
|
|
Berlin Germany
|
|
|
|
|
|
Riyadh Saudi Arabia
|
|
|
|
|
|
Singapore Singapore
|
|
|
|
|
|
Bangkok Thailand
|
|
|
|
|
|
Istanbul Turkey
|
|
|
|
|
|
Ankara Turkey
|
|
|
|
|
|
Moscow Russian Federation
|
|
|
|
|
|
St Petersburg Russian Federation
|
|
|
|
|
|
Ho Chi Minh City Vietnam
|
|
|
|
|
|
New York United States
|
|
|
|
|
|
Los Angeles United States
|
|
|
|
|
|
set join_cache_level=8;
|
2010-08-31 18:34:21 +02:00
|
|
|
|
set join_buffer_size=384;
|
2009-12-21 03:26:15 +01:00
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND City.Population > 3000000;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE City range Population,Country Population 4 NULL # Using index condition; Using MRR
|
|
|
|
|
|
1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country # Using join buffer
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND City.Population > 3000000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Sydney Australia
|
|
|
|
|
|
Dhaka Bangladesh
|
|
|
|
|
|
Rio de Janeiro Brazil
|
|
|
|
|
|
São Paulo Brazil
|
|
|
|
|
|
London United Kingdom
|
|
|
|
|
|
Santiago de Chile Chile
|
|
|
|
|
|
Alexandria Egypt
|
|
|
|
|
|
Cairo Egypt
|
|
|
|
|
|
Jakarta Indonesia
|
|
|
|
|
|
Delhi India
|
|
|
|
|
|
Calcutta [Kolkata] India
|
|
|
|
|
|
Chennai (Madras) India
|
2010-08-31 18:34:21 +02:00
|
|
|
|
Mumbai (Bombay) India
|
2009-12-21 03:26:15 +01:00
|
|
|
|
Baghdad Iraq
|
|
|
|
|
|
Teheran Iran
|
|
|
|
|
|
Tokyo Japan
|
|
|
|
|
|
Jokohama [Yokohama] Japan
|
|
|
|
|
|
Peking China
|
|
|
|
|
|
Chongqing China
|
2010-08-31 18:34:21 +02:00
|
|
|
|
Tianjin China
|
2009-12-21 03:26:15 +01:00
|
|
|
|
Wuhan China
|
|
|
|
|
|
Harbin China
|
|
|
|
|
|
Shenyang China
|
2010-08-31 18:34:21 +02:00
|
|
|
|
Shanghai China
|
2009-12-21 03:26:15 +01:00
|
|
|
|
Chengdu China
|
2010-08-31 18:34:21 +02:00
|
|
|
|
Kanton [Guangzhou] China
|
2009-12-21 03:26:15 +01:00
|
|
|
|
Santafé de Bogotá Colombia
|
|
|
|
|
|
Kinshasa Congo, The Democratic Republic of the
|
|
|
|
|
|
Pusan South Korea
|
2010-08-31 18:34:21 +02:00
|
|
|
|
Seoul South Korea
|
2009-12-21 03:26:15 +01:00
|
|
|
|
Ciudad de México Mexico
|
|
|
|
|
|
Rangoon (Yangon) Myanmar
|
|
|
|
|
|
Lahore Pakistan
|
2010-08-31 18:34:21 +02:00
|
|
|
|
Karachi Pakistan
|
2009-12-21 03:26:15 +01:00
|
|
|
|
Lima Peru
|
|
|
|
|
|
Berlin Germany
|
|
|
|
|
|
Riyadh Saudi Arabia
|
|
|
|
|
|
Singapore Singapore
|
|
|
|
|
|
Bangkok Thailand
|
|
|
|
|
|
Istanbul Turkey
|
2010-08-31 18:34:21 +02:00
|
|
|
|
Ankara Turkey
|
2009-12-21 03:26:15 +01:00
|
|
|
|
St Petersburg Russian Federation
|
|
|
|
|
|
Moscow Russian Federation
|
|
|
|
|
|
Ho Chi Minh City Vietnam
|
|
|
|
|
|
Los Angeles United States
|
|
|
|
|
|
New York United States
|
|
|
|
|
|
set join_buffer_size=default;
|
|
|
|
|
|
set join_cache_level=6;
|
|
|
|
|
|
ALTER TABLE Country MODIFY Name varchar(52) NOT NULL default '';
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
ALTER TABLE Country MODIFY Name varchar(300) NOT NULL default '';
|
|
|
|
|
|
SELECT City.Name, Country.Name FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name
|
|
|
|
|
|
Vientiane Laos
|
|
|
|
|
|
Riga Latvia
|
|
|
|
|
|
Daugavpils Latvia
|
|
|
|
|
|
Maseru Lesotho
|
|
|
|
|
|
Beirut Lebanon
|
|
|
|
|
|
Tripoli Lebanon
|
|
|
|
|
|
Monrovia Liberia
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya
|
|
|
|
|
|
Vilnius Lithuania
|
|
|
|
|
|
Kaunas Lithuania
|
|
|
|
|
|
Klaipeda Lithuania
|
|
|
|
|
|
?iauliai Lithuania
|
|
|
|
|
|
Panevezys Lithuania
|
|
|
|
|
|
ALTER TABLE Country ADD COLUMN PopulationBar text;
|
|
|
|
|
|
UPDATE Country
|
|
|
|
|
|
SET PopulationBar=REPEAT('x', CAST(Population/100000 AS unsigned int));
|
|
|
|
|
|
SELECT City.Name, Country.Name, Country.PopulationBar FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name PopulationBar
|
|
|
|
|
|
Vientiane Laos xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Riga Latvia xxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Daugavpils Latvia xxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Maseru Lesotho xxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Beirut Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Tripoli Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Monrovia Liberia xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Vilnius Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Kaunas Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Klaipeda Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
?iauliai Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Panevezys Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
set join_buffer_size=256;
|
|
|
|
|
|
SELECT City.Name, Country.Name, Country.PopulationBar FROM City,Country
|
|
|
|
|
|
WHERE City.Country=Country.Code AND
|
|
|
|
|
|
Country.Name LIKE 'L%' AND City.Population > 100000;
|
|
|
|
|
|
Name Name PopulationBar
|
|
|
|
|
|
Vientiane Laos xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Riga Latvia xxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Daugavpils Latvia xxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Maseru Lesotho xxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Beirut Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Tripoli Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Monrovia Liberia xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Tripoli Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Bengasi Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Misrata Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Vilnius Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Kaunas Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Klaipeda Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
?iauliai Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
Panevezys Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
set join_buffer_size=default;
|
|
|
|
|
|
DROP DATABASE world;
|
|
|
|
|
|
use test;
|
|
|
|
|
|
CREATE TABLE t1(
|
|
|
|
|
|
affiliatetometaid int NOT NULL default '0',
|
|
|
|
|
|
uniquekey int NOT NULL default '0',
|
|
|
|
|
|
metaid int NOT NULL default '0',
|
|
|
|
|
|
affiliateid int NOT NULL default '0',
|
|
|
|
|
|
xml text,
|
|
|
|
|
|
isactive char(1) NOT NULL default 'Y',
|
|
|
|
|
|
PRIMARY KEY (affiliatetometaid)
|
|
|
|
|
|
);
|
|
|
|
|
|
CREATE UNIQUE INDEX t1_uniquekey ON t1(uniquekey);
|
|
|
|
|
|
CREATE INDEX t1_affiliateid ON t1(affiliateid);
|
|
|
|
|
|
CREATE INDEX t1_metaid on t1 (metaid);
|
|
|
|
|
|
INSERT INTO t1 VALUES
|
|
|
|
|
|
(1616, 1571693233, 1391, 2, NULL, 'Y'), (1943, 1993216749, 1726, 2, NULL, 'Y');
|
|
|
|
|
|
CREATE TABLE t2(
|
|
|
|
|
|
metaid int NOT NULL default '0',
|
|
|
|
|
|
name varchar(80) NOT NULL default '',
|
|
|
|
|
|
dateadded timestamp NOT NULL ,
|
|
|
|
|
|
xml text,
|
|
|
|
|
|
status int default NULL,
|
|
|
|
|
|
origin int default NULL,
|
|
|
|
|
|
gid int NOT NULL default '1',
|
|
|
|
|
|
formattypeid int default NULL,
|
|
|
|
|
|
PRIMARY KEY (metaid)
|
|
|
|
|
|
);
|
|
|
|
|
|
CREATE INDEX t2_status ON t2(status);
|
|
|
|
|
|
CREATE INDEX t2_gid ON t2(gid);
|
|
|
|
|
|
CREATE INDEX t2_formattypeid ON t2(formattypeid);
|
|
|
|
|
|
INSERT INTO t2 VALUES
|
|
|
|
|
|
(1391, "I Just Died", "2003-10-02 10:07:37", "", 1, NULL, 3, NULL),
|
|
|
|
|
|
(1726, "Me, Myself & I", "2003-12-05 11:24:36", " ", 1, NULL, 3, NULL);
|
|
|
|
|
|
CREATE TABLE t3(
|
|
|
|
|
|
mediaid int NOT NULL ,
|
|
|
|
|
|
metaid int NOT NULL default '0',
|
|
|
|
|
|
formatid int NOT NULL default '0',
|
|
|
|
|
|
status int default NULL,
|
|
|
|
|
|
path varchar(100) NOT NULL default '',
|
|
|
|
|
|
datemodified timestamp NOT NULL ,
|
|
|
|
|
|
resourcetype int NOT NULL default '1',
|
|
|
|
|
|
parameters text,
|
|
|
|
|
|
signature int default NULL,
|
|
|
|
|
|
quality int NOT NULL default '255',
|
|
|
|
|
|
PRIMARY KEY (mediaid)
|
|
|
|
|
|
);
|
|
|
|
|
|
CREATE INDEX t3_metaid ON t3(metaid);
|
|
|
|
|
|
CREATE INDEX t3_formatid ON t3(formatid);
|
|
|
|
|
|
CREATE INDEX t3_status ON t3(status);
|
|
|
|
|
|
CREATE INDEX t3_metaidformatid ON t3(metaid,formatid);
|
|
|
|
|
|
CREATE INDEX t3_signature ON t3(signature);
|
|
|
|
|
|
CREATE INDEX t3_quality ON t3(quality);
|
|
|
|
|
|
INSERT INTO t3 VALUES
|
|
|
|
|
|
(6, 4, 8, 0, "010101_anastacia_spmidi.mid", "2004-03-16 13:40:00", 1, NULL, NULL, 255),
|
|
|
|
|
|
(3343, 3, 8, 1, "010102_4VN4bsPwnxRQUJW5Zp1RhG2IL9vvl_8.mid", "2004-03-16 13:40:00", 1, NULL, NULL, 255);
|
|
|
|
|
|
CREATE TABLE t4(
|
|
|
|
|
|
formatid int NOT NULL ,
|
|
|
|
|
|
name varchar(60) NOT NULL default '',
|
|
|
|
|
|
formatclassid int NOT NULL default '0',
|
|
|
|
|
|
mime varchar(60) default NULL,
|
|
|
|
|
|
extension varchar(10) default NULL,
|
|
|
|
|
|
priority int NOT NULL default '0',
|
|
|
|
|
|
canaddtocapability char(1) NOT NULL default 'Y',
|
|
|
|
|
|
PRIMARY KEY (formatid)
|
|
|
|
|
|
);
|
|
|
|
|
|
CREATE INDEX t4_formatclassid ON t4(formatclassid);
|
|
|
|
|
|
CREATE INDEX t4_formats_idx ON t4(canaddtocapability);
|
|
|
|
|
|
INSERT INTO t4 VALUES
|
|
|
|
|
|
(19, "XHTML", 11, "text/html", "xhtml", 10, 'Y'),
|
|
|
|
|
|
(54, "AMR (wide band)", 13, "audio/amr-wb", "awb", 0, 'Y');
|
|
|
|
|
|
CREATE TABLE t5(
|
|
|
|
|
|
formatclassid int NOT NULL ,
|
|
|
|
|
|
name varchar(60) NOT NULL default '',
|
|
|
|
|
|
priority int NOT NULL default '0',
|
|
|
|
|
|
formattypeid int NOT NULL default '0',
|
|
|
|
|
|
PRIMARY KEY (formatclassid)
|
|
|
|
|
|
);
|
|
|
|
|
|
CREATE INDEX t5_formattypeid on t5(formattypeid);
|
|
|
|
|
|
INSERT INTO t5 VALUES
|
|
|
|
|
|
(11, "Info", 0, 4), (13, "Digital Audio", 0, 2);
|
|
|
|
|
|
CREATE TABLE t6(
|
|
|
|
|
|
formattypeid int NOT NULL ,
|
|
|
|
|
|
name varchar(60) NOT NULL default '',
|
|
|
|
|
|
priority int default NULL,
|
|
|
|
|
|
PRIMARY KEY (formattypeid)
|
|
|
|
|
|
);
|
|
|
|
|
|
INSERT INTO t6 VALUES
|
|
|
|
|
|
(2, "Ringtones", 0);
|
|
|
|
|
|
CREATE TABLE t7(
|
|
|
|
|
|
metaid int NOT NULL default '0',
|
|
|
|
|
|
artistid int NOT NULL default '0',
|
|
|
|
|
|
PRIMARY KEY (metaid,artistid)
|
|
|
|
|
|
);
|
|
|
|
|
|
INSERT INTO t7 VALUES
|
|
|
|
|
|
(4, 5), (3, 4);
|
|
|
|
|
|
CREATE TABLE t8(
|
|
|
|
|
|
artistid int NOT NULL ,
|
|
|
|
|
|
name varchar(80) NOT NULL default '',
|
|
|
|
|
|
PRIMARY KEY (artistid)
|
|
|
|
|
|
);
|
|
|
|
|
|
INSERT INTO t8 VALUES
|
|
|
|
|
|
(5, "Anastacia"), (4, "John Mayer");
|
|
|
|
|
|
CREATE TABLE t9(
|
|
|
|
|
|
subgenreid int NOT NULL default '0',
|
|
|
|
|
|
metaid int NOT NULL default '0',
|
|
|
|
|
|
PRIMARY KEY (subgenreid,metaid)
|
|
|
|
|
|
) ;
|
|
|
|
|
|
CREATE INDEX t9_subgenreid ON t9(subgenreid);
|
|
|
|
|
|
CREATE INDEX t9_metaid ON t9(metaid);
|
|
|
|
|
|
INSERT INTO t9 VALUES
|
|
|
|
|
|
(138, 4), (31, 3);
|
|
|
|
|
|
CREATE TABLE t10(
|
|
|
|
|
|
subgenreid int NOT NULL ,
|
|
|
|
|
|
genreid int NOT NULL default '0',
|
|
|
|
|
|
name varchar(80) NOT NULL default '',
|
|
|
|
|
|
PRIMARY KEY (subgenreid)
|
|
|
|
|
|
) ;
|
|
|
|
|
|
CREATE INDEX t10_genreid ON t10(genreid);
|
|
|
|
|
|
INSERT INTO t10 VALUES
|
|
|
|
|
|
(138, 19, ''), (31, 3, '');
|
|
|
|
|
|
CREATE TABLE t11(
|
|
|
|
|
|
genreid int NOT NULL default '0',
|
|
|
|
|
|
name char(80) NOT NULL default '',
|
|
|
|
|
|
priority int NOT NULL default '0',
|
|
|
|
|
|
masterclip char(1) default NULL,
|
|
|
|
|
|
PRIMARY KEY (genreid)
|
|
|
|
|
|
) ;
|
|
|
|
|
|
CREATE INDEX t11_masterclip ON t11( masterclip);
|
|
|
|
|
|
INSERT INTO t11 VALUES
|
|
|
|
|
|
(19, "Pop & Dance", 95, 'Y'), (3, "Rock & Alternative", 100, 'Y');
|
|
|
|
|
|
set join_cache_level=6;
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT t1.uniquekey, t1.xml AS affiliateXml,
|
|
|
|
|
|
t8.name AS artistName, t8.artistid,
|
|
|
|
|
|
t11.name AS genreName, t11.genreid, t11.priority AS genrePriority,
|
|
|
|
|
|
t10.subgenreid, t10.name AS subgenreName,
|
|
|
|
|
|
t2.name AS metaName, t2.metaid, t2.xml AS metaXml,
|
|
|
|
|
|
t4.priority + t5.priority + t6.priority AS overallPriority,
|
|
|
|
|
|
t3.path AS path, t3.mediaid,
|
|
|
|
|
|
t4.formatid, t4.name AS formatName,
|
|
|
|
|
|
t5.formatclassid, t5.name AS formatclassName,
|
|
|
|
|
|
t6.formattypeid, t6.name AS formattypeName
|
|
|
|
|
|
FROM t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11
|
|
|
|
|
|
WHERE t7.metaid = t2.metaid AND t7.artistid = t8.artistid AND
|
|
|
|
|
|
t9.metaid = t2.metaid AND t9.subgenreid = t10.subgenreid AND
|
|
|
|
|
|
t10.genreid = t11.genreid AND t3.metaid = t2.metaid AND
|
|
|
|
|
|
t3.formatid = t4.formatid AND t4.formatclassid = t5.formatclassid AND
|
|
|
|
|
|
t4.canaddtocapability = 'Y' AND t5.formattypeid = t6.formattypeid AND
|
|
|
|
|
|
t6.formattypeid IN (2) AND (t3.formatid IN (31, 8, 76)) AND
|
|
|
|
|
|
t1.metaid = t2.metaid AND t1.affiliateid = '2';
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t6 system PRIMARY NULL NULL NULL 1
|
|
|
|
|
|
1 SIMPLE t1 ref t1_affiliateid,t1_metaid t1_affiliateid 4 const 1
|
|
|
|
|
|
1 SIMPLE t4 ref PRIMARY,t4_formatclassid,t4_formats_idx t4_formats_idx 1 const 1 Using index condition; Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE t5 eq_ref PRIMARY,t5_formattypeid PRIMARY 4 test.t4.formatclassid 1 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.metaid 1 Using join buffer
|
|
|
|
|
|
1 SIMPLE t7 ref PRIMARY PRIMARY 4 test.t1.metaid 1 Using index
|
|
|
|
|
|
1 SIMPLE t3 ref t3_metaid,t3_formatid,t3_metaidformatid t3_metaid 4 test.t1.metaid 2 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE t8 eq_ref PRIMARY PRIMARY 4 test.t7.artistid 1 Using join buffer
|
|
|
|
|
|
1 SIMPLE t9 index PRIMARY,t9_subgenreid,t9_metaid PRIMARY 8 NULL 2 Using where; Using index; Using join buffer
|
|
|
|
|
|
1 SIMPLE t10 eq_ref PRIMARY,t10_genreid PRIMARY 4 test.t9.subgenreid 1 Using join buffer
|
|
|
|
|
|
1 SIMPLE t11 eq_ref PRIMARY PRIMARY 4 test.t10.genreid 1 Using join buffer
|
|
|
|
|
|
SELECT t1.uniquekey, t1.xml AS affiliateXml,
|
|
|
|
|
|
t8.name AS artistName, t8.artistid,
|
|
|
|
|
|
t11.name AS genreName, t11.genreid, t11.priority AS genrePriority,
|
|
|
|
|
|
t10.subgenreid, t10.name AS subgenreName,
|
|
|
|
|
|
t2.name AS metaName, t2.metaid, t2.xml AS metaXml,
|
|
|
|
|
|
t4.priority + t5.priority + t6.priority AS overallPriority,
|
|
|
|
|
|
t3.path AS path, t3.mediaid,
|
|
|
|
|
|
t4.formatid, t4.name AS formatName,
|
|
|
|
|
|
t5.formatclassid, t5.name AS formatclassName,
|
|
|
|
|
|
t6.formattypeid, t6.name AS formattypeName
|
|
|
|
|
|
FROM t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11
|
|
|
|
|
|
WHERE t7.metaid = t2.metaid AND t7.artistid = t8.artistid AND
|
|
|
|
|
|
t9.metaid = t2.metaid AND t9.subgenreid = t10.subgenreid AND
|
|
|
|
|
|
t10.genreid = t11.genreid AND t3.metaid = t2.metaid AND
|
|
|
|
|
|
t3.formatid = t4.formatid AND t4.formatclassid = t5.formatclassid AND
|
|
|
|
|
|
t4.canaddtocapability = 'Y' AND t5.formattypeid = t6.formattypeid AND
|
|
|
|
|
|
t6.formattypeid IN (2) AND (t3.formatid IN (31, 8, 76)) AND
|
|
|
|
|
|
t1.metaid = t2.metaid AND t1.affiliateid = '2';
|
|
|
|
|
|
uniquekey affiliateXml artistName artistid genreName genreid genrePriority subgenreid subgenreName metaName metaid metaXml overallPriority path mediaid formatid formatName formatclassid formatclassName formattypeid formattypeName
|
|
|
|
|
|
DROP TABLE t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11;
|
|
|
|
|
|
CREATE TABLE t1 (a1 int, filler1 char(64) default ' ' );
|
|
|
|
|
|
CREATE TABLE t2 (
|
|
|
|
|
|
a2 int, b2 int, filler2 char(64) default ' ',
|
|
|
|
|
|
PRIMARY KEY idx(a2,b2,filler2)
|
|
|
|
|
|
) ;
|
|
|
|
|
|
CREATE TABLE t3 (b3 int, c3 int, INDEX idx(b3));
|
|
|
|
|
|
INSERT INTO t1(a1) VALUES
|
|
|
|
|
|
(4), (7), (1), (9), (8), (5), (3), (6), (2);
|
|
|
|
|
|
INSERT INTO t2(a2,b2) VALUES
|
|
|
|
|
|
(1,30), (3,40), (2,61), (6,73), (8,92), (9,27), (4,18), (5,84), (7,56),
|
|
|
|
|
|
(4,14), (6,76), (8,98), (7,55), (1,39), (2,68), (3,45), (9,21), (5,81),
|
|
|
|
|
|
(5,88), (2,65), (6,74), (9,23), (1,37), (3,44), (4,17), (8,99), (7,51),
|
|
|
|
|
|
(9,28), (7,52), (1,33), (4,13), (5,87), (3,43), (8,91), (2,62), (6,79),
|
|
|
|
|
|
(3,49), (8,93), (7,34), (5,82), (6,78), (2,63), (1,32), (9,22), (4,11);
|
|
|
|
|
|
INSERT INTO t3 VALUES
|
|
|
|
|
|
(30,302), (92,923), (18,187), (45,459), (30,309),
|
|
|
|
|
|
(39,393), (68,685), (45,458), (21,210), (81,817),
|
|
|
|
|
|
(40,405), (61,618), (73,738), (92,929), (27,275),
|
|
|
|
|
|
(18,188), (84,846), (56,564), (14,144), (76,763),
|
|
|
|
|
|
(98,982), (55,551), (17,174), (99,998), (51,513),
|
|
|
|
|
|
(28,282), (52,527), (33,336), (13,138), (87,878),
|
|
|
|
|
|
(43,431), (91,916), (62,624), (79,797), (49,494),
|
|
|
|
|
|
(93,933), (34,347), (82,829), (78,780), (63,634),
|
|
|
|
|
|
(32,329), (22,228), (11,114), (74,749), (23,236);
|
|
|
|
|
|
set join_cache_level=1;
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT a1<>a2, a1, a2, b2, b3, c3,
|
|
|
|
|
|
SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
|
|
|
|
|
|
FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 9
|
|
|
|
|
|
1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a1 1 Using index
|
|
|
|
|
|
1 SIMPLE t3 ref idx idx 5 test.t2.b2 5 Using where
|
|
|
|
|
|
SELECT a1<>a2, a1, a2, b2, b3, c3,
|
|
|
|
|
|
SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
|
|
|
|
|
|
FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
|
|
|
|
|
|
a1<>a2 a1 a2 b2 b3 c3 s1 s2
|
|
|
|
|
|
0 4 4 13 13 138
|
|
|
|
|
|
0 4 4 18 18 188
|
|
|
|
|
|
0 1 1 30 30 309
|
|
|
|
|
|
0 1 1 32 32 329
|
|
|
|
|
|
0 9 9 22 22 228
|
|
|
|
|
|
0 8 8 92 92 929
|
|
|
|
|
|
0 8 8 99 99 998
|
|
|
|
|
|
0 5 5 82 82 829
|
|
|
|
|
|
0 5 5 87 87 878
|
|
|
|
|
|
0 3 3 45 45 459
|
|
|
|
|
|
0 3 3 45 45 458
|
|
|
|
|
|
0 6 6 73 73 738
|
|
|
|
|
|
0 6 6 74 74 749
|
|
|
|
|
|
0 2 2 61 61 618
|
|
|
|
|
|
set join_cache_level=5;
|
|
|
|
|
|
set join_buffer_size=512;
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT a1<>a2, a1, a2, b2, b3, c3,
|
|
|
|
|
|
SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
|
|
|
|
|
|
FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 9
|
|
|
|
|
|
1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a1 1 Using index
|
|
|
|
|
|
1 SIMPLE t3 ref idx idx 5 test.t2.b2 5 Using where; Using join buffer
|
|
|
|
|
|
SELECT a1<>a2, a1, a2, b2, b3, c3,
|
|
|
|
|
|
SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
|
|
|
|
|
|
FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
|
|
|
|
|
|
a1<>a2 a1 a2 b2 b3 c3 s1 s2
|
|
|
|
|
|
0 4 4 18 18 188
|
|
|
|
|
|
0 4 4 13 13 138
|
|
|
|
|
|
0 1 1 30 30 309
|
|
|
|
|
|
0 1 1 32 32 329
|
|
|
|
|
|
0 9 9 22 22 228
|
|
|
|
|
|
0 8 8 92 92 929
|
|
|
|
|
|
0 8 8 99 99 998
|
|
|
|
|
|
0 5 5 82 82 829
|
|
|
|
|
|
0 3 3 45 45 459
|
|
|
|
|
|
0 3 3 45 45 458
|
|
|
|
|
|
0 5 5 87 87 878
|
|
|
|
|
|
0 2 2 61 61 618
|
|
|
|
|
|
0 6 6 73 73 738
|
|
|
|
|
|
0 6 6 74 74 749
|
|
|
|
|
|
DROP TABLE t1,t2,t3;
|
|
|
|
|
|
CREATE TABLE t1 (a int, b int, INDEX idx(b));
|
|
|
|
|
|
CREATE TABLE t2 (a int, b int, INDEX idx(a));
|
|
|
|
|
|
INSERT INTO t1 VALUES (5,30), (3,20), (7,40), (2,10), (8,30), (1,10), (4,20);
|
|
|
|
|
|
INSERT INTO t2 VALUES (7,10), (1,20), (2,20), (8,20), (8,10), (1,20);
|
|
|
|
|
|
INSERT INTO t2 VALUES (1,10), (4,20), (3,20), (7,20), (7,10), (1,20);
|
|
|
|
|
|
set join_buffer_size=32;
|
|
|
|
|
|
Warnings:
|
|
|
|
|
|
Warning 1292 Truncated incorrect join_buffer_size value: '32'
|
|
|
|
|
|
set join_cache_level=8;
|
|
|
|
|
|
EXPLAIN SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b >= 30;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL idx NULL NULL NULL 7 Using where
|
|
|
|
|
|
1 SIMPLE t2 ref idx idx 5 test.t1.a 2 Using join buffer
|
|
|
|
|
|
SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b >= 30;
|
|
|
|
|
|
a b a b
|
|
|
|
|
|
7 40 7 10
|
|
|
|
|
|
7 40 7 10
|
|
|
|
|
|
7 40 7 20
|
|
|
|
|
|
8 30 8 10
|
|
|
|
|
|
8 30 8 20
|
|
|
|
|
|
DROP TABLE t1,t2;
|
|
|
|
|
|
#
|
|
|
|
|
|
# Bug #40134: outer join with not exists optimization and join buffer
|
|
|
|
|
|
#
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
set join_buffer_size=default;
|
|
|
|
|
|
CREATE TABLE t1 (a int NOT NULL);
|
|
|
|
|
|
INSERT INTO t1 VALUES (2), (4), (3), (5), (1);
|
|
|
|
|
|
CREATE TABLE t2 (a int NOT NULL, b int NOT NULL, INDEX i_a(a));
|
|
|
|
|
|
INSERT INTO t2 VALUES (4,10), (2,10), (2,30), (2,20), (4,20);
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 5
|
|
|
|
|
|
1 SIMPLE t2 ref i_a i_a 4 test.t1.a 2 Using where; Not exists
|
|
|
|
|
|
SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
|
|
|
|
|
|
a a b
|
|
|
|
|
|
3 NULL NULL
|
|
|
|
|
|
5 NULL NULL
|
|
|
|
|
|
1 NULL NULL
|
|
|
|
|
|
SET join_cache_level=6;
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 5
|
|
|
|
|
|
1 SIMPLE t2 ref i_a i_a 4 test.t1.a 2 Using where; Not exists; Using join buffer
|
|
|
|
|
|
SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
|
|
|
|
|
|
a a b
|
|
|
|
|
|
3 NULL NULL
|
|
|
|
|
|
5 NULL NULL
|
|
|
|
|
|
1 NULL NULL
|
|
|
|
|
|
DROP TABLE t1, t2;
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
set join_buffer_size=default;
|
|
|
|
|
|
#
|
|
|
|
|
|
# BUG#40136: Group by is ignored when join buffer is used for an outer join
|
|
|
|
|
|
#
|
|
|
|
|
|
create table t1(a int PRIMARY KEY, b int);
|
|
|
|
|
|
insert into t1 values
|
|
|
|
|
|
(5, 10), (2, 70), (7, 80), (6, 20), (1, 50), (9, 40), (8, 30), (3, 60);
|
|
|
|
|
|
create table t2 (p int, a int, INDEX i_a(a));
|
|
|
|
|
|
insert into t2 values
|
|
|
|
|
|
(103, 7), (109, 3), (102, 3), (108, 1), (106, 3),
|
|
|
|
|
|
(107, 7), (105, 1), (101, 3), (100, 7), (110, 1);
|
|
|
|
|
|
set @save_join_cache_level=@@join_cache_level;
|
|
|
|
|
|
set join_cache_level=6;
|
|
|
|
|
|
The following must not show "using join cache":
|
|
|
|
|
|
explain
|
|
|
|
|
|
select t1.a, count(t2.p) as count
|
|
|
|
|
|
from t1 left join t2 on t1.a=t2.a and t2.p % 2 = 1 group by t1.a;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using temporary; Using filesort
|
|
|
|
|
|
1 SIMPLE t2 ref i_a i_a 5 test.t1.a 2 Using where; Using join buffer
|
|
|
|
|
|
select t1.a, count(t2.p) as count
|
|
|
|
|
|
from t1 left join t2 on t1.a=t2.a and t2.p % 2 = 1 group by t1.a;
|
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|
|
a count
|
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|
|
1 1
|
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|
|
2 0
|
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|
3 2
|
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|
|
5 0
|
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|
|
6 0
|
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|
|
7 2
|
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|
|
8 0
|
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|
|
9 0
|
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|
|
set join_cache_level=@save_join_cache_level;
|
|
|
|
|
|
drop table t1, t2;
|
|
|
|
|
|
#
|
|
|
|
|
|
# BUG#40268: Nested outer join with not null-rejecting where condition
|
|
|
|
|
|
# over an inner table which is not the last in the nest
|
|
|
|
|
|
#
|
|
|
|
|
|
CREATE TABLE t2 (a int, b int, c int);
|
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|
|
CREATE TABLE t3 (a int, b int, c int);
|
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|
|
CREATE TABLE t4 (a int, b int, c int);
|
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|
|
INSERT INTO t2 VALUES (3,3,0), (4,2,0), (5,3,0);
|
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|
|
|
INSERT INTO t3 VALUES (1,2,0), (2,2,0);
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|
|
|
INSERT INTO t4 VALUES (3,2,0), (4,2,0);
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|
|
|
|
set join_cache_level=6;
|
|
|
|
|
|
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
|
|
|
|
|
|
FROM t2 LEFT JOIN (t3, t4) ON t2.b=t4.b
|
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|
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|
|
WHERE t3.a+2<t2.a OR t3.c IS NULL;
|
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|
|
a b a b a b
|
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|
|
4 2 1 2 3 2
|
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|
|
4 2 1 2 4 2
|
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|
|
3 3 NULL NULL NULL NULL
|
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|
|
5 3 NULL NULL NULL NULL
|
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|
|
set join_cache_level=default;
|
|
|
|
|
|
DROP TABLE t2, t3, t4;
|
|
|
|
|
|
#
|
|
|
|
|
|
# Bug #40192: outer join with where clause when using BNL
|
|
|
|
|
|
#
|
|
|
|
|
|
create table t1 (a int, b int);
|
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|
|
insert into t1 values (2, 20), (3, 30), (1, 10);
|
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|
|
|
create table t2 (a int, c int);
|
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|
|
insert into t2 values (1, 101), (3, 102), (1, 100);
|
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|
|
|
set join_cache_level=6;
|
|
|
|
|
|
select * from t1 left join t2 on t1.a=t2.a;
|
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|
|
a b a c
|
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|
|
1 10 1 101
|
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|
|
3 30 3 102
|
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|
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|
|
1 10 1 100
|
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|
|
|
|
2 20 NULL NULL
|
|
|
|
|
|
explain select * from t1 left join t2 on t1.a=t2.a where t2.c=102 or t2.c is null;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
|
|
|
|
|
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where; Using join buffer
|
|
|
|
|
|
select * from t1 left join t2 on t1.a=t2.a where t2.c=102 or t2.c is null;
|
|
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|
|
|
a b a c
|
|
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|
|
|
3 30 3 102
|
|
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|
|
|
2 20 NULL NULL
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
drop table t1, t2;
|
|
|
|
|
|
#
|
|
|
|
|
|
# Bug #40317: outer join with with constant on expression equal to FALSE
|
|
|
|
|
|
#
|
|
|
|
|
|
create table t1 (a int);
|
|
|
|
|
|
insert into t1 values (30), (40), (20);
|
|
|
|
|
|
create table t2 (b int);
|
|
|
|
|
|
insert into t2 values (200), (100);
|
|
|
|
|
|
set join_cache_level=6;
|
|
|
|
|
|
select * from t1 left join t2 on (1=0);
|
|
|
|
|
|
a b
|
|
|
|
|
|
30 NULL
|
|
|
|
|
|
40 NULL
|
|
|
|
|
|
20 NULL
|
|
|
|
|
|
explain select * from t1 left join t2 on (1=0) where a=40;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
|
|
|
|
|
|
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer
|
|
|
|
|
|
select * from t1 left join t2 on (1=0) where a=40;
|
|
|
|
|
|
a b
|
|
|
|
|
|
40 NULL
|
2010-08-31 18:34:21 +02:00
|
|
|
|
set join_cache_level=0;
|
2009-12-21 03:26:15 +01:00
|
|
|
|
explain select * from t1 left join t2 on (1=0);
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
|
|
|
|
|
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
drop table t1, t2;
|
|
|
|
|
|
#
|
|
|
|
|
|
# Bug #41204: small buffer with big rec_per_key for ref access
|
|
|
|
|
|
#
|
|
|
|
|
|
CREATE TABLE t1 (a int);
|
|
|
|
|
|
INSERT INTO t1 VALUES (0);
|
|
|
|
|
|
INSERT INTO t1(a) SELECT a FROM t1;
|
|
|
|
|
|
INSERT INTO t1(a) SELECT a FROM t1;
|
|
|
|
|
|
INSERT INTO t1(a) SELECT a FROM t1;
|
|
|
|
|
|
INSERT INTO t1(a) SELECT a FROM t1;
|
|
|
|
|
|
INSERT INTO t1(a) SELECT a FROM t1;
|
|
|
|
|
|
INSERT INTO t1(a) SELECT a FROM t1;
|
|
|
|
|
|
INSERT INTO t1(a) SELECT a FROM t1;
|
|
|
|
|
|
INSERT INTO t1(a) SELECT a FROM t1;
|
|
|
|
|
|
INSERT INTO t1(a) SELECT a FROM t1;
|
|
|
|
|
|
INSERT INTO t1(a) SELECT a FROM t1;
|
|
|
|
|
|
INSERT INTO t1(a) SELECT a FROM t1;
|
|
|
|
|
|
INSERT INTO t1 VALUES (20000), (10000);
|
|
|
|
|
|
CREATE TABLE t2 (pk int AUTO_INCREMENT PRIMARY KEY, b int, c int, INDEX idx(b));
|
|
|
|
|
|
INSERT INTO t2(b,c) VALUES (10000, 3), (20000, 7), (20000, 1), (10000, 9), (20000, 5);
|
|
|
|
|
|
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
|
|
|
|
|
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
|
|
|
|
|
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
|
|
|
|
|
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
|
|
|
|
|
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
|
|
|
|
|
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
|
|
|
|
|
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
|
|
|
|
|
INSERT INTO t2(b,c) SELECT b,c FROM t2;
|
|
|
|
|
|
ANALYZE TABLE t1,t2;
|
|
|
|
|
|
set join_cache_level=6;
|
|
|
|
|
|
set join_buffer_size=1024;
|
|
|
|
|
|
EXPLAIN SELECT AVG(c) FROM t1,t2 WHERE t1.a=t2.b;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 2050
|
|
|
|
|
|
1 SIMPLE t2 ref idx idx 5 test.t1.a 640 Using join buffer
|
|
|
|
|
|
SELECT AVG(c) FROM t1,t2 WHERE t1.a=t2.b;
|
|
|
|
|
|
AVG(c)
|
|
|
|
|
|
5.0000
|
|
|
|
|
|
set join_buffer_size=default;
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
DROP TABLE t1, t2;
|
|
|
|
|
|
#
|
|
|
|
|
|
# Bug #41894: big join buffer of level 7 used to join records
|
|
|
|
|
|
# with null values in place of varchar strings
|
|
|
|
|
|
#
|
|
|
|
|
|
CREATE TABLE t1 (a int NOT NULL AUTO_INCREMENT PRIMARY KEY,
|
|
|
|
|
|
b varchar(127) DEFAULT NULL);
|
|
|
|
|
|
INSERT INTO t1(a) VALUES (1);
|
|
|
|
|
|
INSERT INTO t1(b) SELECT b FROM t1;
|
|
|
|
|
|
INSERT INTO t1(b) SELECT b FROM t1;
|
|
|
|
|
|
INSERT INTO t1(b) SELECT b FROM t1;
|
|
|
|
|
|
INSERT INTO t1(b) SELECT b FROM t1;
|
|
|
|
|
|
INSERT INTO t1(b) SELECT b FROM t1;
|
|
|
|
|
|
INSERT INTO t1(b) SELECT b FROM t1;
|
|
|
|
|
|
INSERT INTO t1(b) SELECT b FROM t1;
|
|
|
|
|
|
INSERT INTO t1(b) SELECT b FROM t1;
|
|
|
|
|
|
INSERT INTO t1(b) SELECT b FROM t1;
|
|
|
|
|
|
INSERT INTO t1(b) SELECT b FROM t1;
|
|
|
|
|
|
INSERT INTO t1(b) SELECT b FROM t1;
|
|
|
|
|
|
INSERT INTO t1(b) SELECT b FROM t1;
|
|
|
|
|
|
INSERT INTO t1(b) SELECT b FROM t1;
|
|
|
|
|
|
INSERT INTO t1(b) SELECT b FROM t1;
|
|
|
|
|
|
CREATE TABLE t2 (a int NOT NULL PRIMARY KEY, b varchar(127) DEFAULT NULL);
|
|
|
|
|
|
INSERT INTO t2 SELECT * FROM t1;
|
|
|
|
|
|
CREATE TABLE t3 (a int NOT NULL PRIMARY KEY, b varchar(127) DEFAULT NULL);
|
|
|
|
|
|
INSERT INTO t3 SELECT * FROM t1;
|
|
|
|
|
|
set join_cache_level=7;
|
|
|
|
|
|
set join_buffer_size=1024*1024;
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT COUNT(*) FROM t1,t2,t3
|
|
|
|
|
|
WHERE t1.a=t2.a AND t2.a=t3.a AND
|
|
|
|
|
|
t1.b IS NULL AND t2.b IS NULL AND t3.b IS NULL;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 16384 Using where
|
|
|
|
|
|
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using join buffer
|
|
|
|
|
|
SELECT COUNT(*) FROM t1,t2,t3
|
|
|
|
|
|
WHERE t1.a=t2.a AND t2.a=t3.a AND
|
|
|
|
|
|
t1.b IS NULL AND t2.b IS NULL AND t3.b IS NULL;
|
|
|
|
|
|
COUNT(*)
|
|
|
|
|
|
16384
|
|
|
|
|
|
set join_buffer_size=default;
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
DROP TABLE t1,t2,t3;
|
|
|
|
|
|
#
|
|
|
|
|
|
# Bug #42020: join buffer is used for outer join with fields of
|
|
|
|
|
|
# several outer tables in join buffer
|
|
|
|
|
|
#
|
|
|
|
|
|
CREATE TABLE t1 (
|
|
|
|
|
|
a bigint NOT NULL,
|
|
|
|
|
|
PRIMARY KEY (a)
|
|
|
|
|
|
);
|
|
|
|
|
|
INSERT INTO t1 VALUES
|
|
|
|
|
|
(2), (1);
|
|
|
|
|
|
CREATE TABLE t2 (
|
|
|
|
|
|
a bigint NOT NULL,
|
|
|
|
|
|
b bigint NOT NULL,
|
|
|
|
|
|
PRIMARY KEY (a,b)
|
|
|
|
|
|
);
|
|
|
|
|
|
INSERT INTO t2 VALUES
|
|
|
|
|
|
(2,30), (2,40), (2,50), (2,60), (2,70), (2,80),
|
|
|
|
|
|
(1,10), (1, 20), (1,30), (1,40), (1,50);
|
|
|
|
|
|
CREATE TABLE t3 (
|
|
|
|
|
|
pk bigint NOT NULL AUTO_INCREMENT,
|
|
|
|
|
|
a bigint NOT NULL,
|
|
|
|
|
|
b bigint NOT NULL,
|
|
|
|
|
|
val bigint DEFAULT '0',
|
|
|
|
|
|
PRIMARY KEY (pk),
|
|
|
|
|
|
KEY idx (a,b)
|
|
|
|
|
|
);
|
|
|
|
|
|
INSERT INTO t3(a,b) VALUES
|
|
|
|
|
|
(2,30), (2,40), (2,50), (2,60), (2,70), (2,80),
|
|
|
|
|
|
(4,30), (4,40), (4,50), (4,60), (4,70), (4,80),
|
|
|
|
|
|
(5,30), (5,40), (5,50), (5,60), (5,70), (5,80),
|
|
|
|
|
|
(7,30), (7,40), (7,50), (7,60), (7,70), (7,80);
|
2010-08-31 18:34:21 +02:00
|
|
|
|
set join_cache_level=0;
|
2009-12-21 03:26:15 +01:00
|
|
|
|
SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val
|
|
|
|
|
|
FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b)
|
|
|
|
|
|
WHERE t1.a=t2.a;
|
|
|
|
|
|
a a a b b val
|
|
|
|
|
|
1 1 NULL 10 NULL NULL
|
|
|
|
|
|
1 1 NULL 20 NULL NULL
|
|
|
|
|
|
1 1 NULL 30 NULL NULL
|
|
|
|
|
|
1 1 NULL 40 NULL NULL
|
|
|
|
|
|
1 1 NULL 50 NULL NULL
|
|
|
|
|
|
2 2 2 30 30 0
|
|
|
|
|
|
2 2 2 40 40 0
|
|
|
|
|
|
2 2 2 50 50 0
|
|
|
|
|
|
2 2 2 60 60 0
|
|
|
|
|
|
2 2 2 70 70 0
|
|
|
|
|
|
2 2 2 80 80 0
|
|
|
|
|
|
set join_cache_level=6;
|
|
|
|
|
|
set join_buffer_size=256;
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val
|
|
|
|
|
|
FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b)
|
|
|
|
|
|
WHERE t1.a=t2.a;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 2 Using index
|
|
|
|
|
|
1 SIMPLE t2 ref PRIMARY PRIMARY 8 test.t1.a 1 Using index
|
|
|
|
|
|
1 SIMPLE t3 ref idx idx 16 test.t1.a,test.t2.b 2 Using join buffer
|
|
|
|
|
|
SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val
|
|
|
|
|
|
FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b)
|
|
|
|
|
|
WHERE t1.a=t2.a;
|
|
|
|
|
|
a a a b b val
|
|
|
|
|
|
1 1 NULL 10 NULL NULL
|
|
|
|
|
|
1 1 NULL 20 NULL NULL
|
|
|
|
|
|
1 1 NULL 30 NULL NULL
|
|
|
|
|
|
1 1 NULL 40 NULL NULL
|
|
|
|
|
|
1 1 NULL 50 NULL NULL
|
|
|
|
|
|
2 2 2 30 30 0
|
|
|
|
|
|
2 2 2 40 40 0
|
|
|
|
|
|
2 2 2 50 50 0
|
|
|
|
|
|
2 2 2 60 60 0
|
|
|
|
|
|
2 2 2 70 70 0
|
|
|
|
|
|
2 2 2 80 80 0
|
|
|
|
|
|
DROP INDEX idx ON t3;
|
2010-08-31 18:34:21 +02:00
|
|
|
|
set join_cache_level=2;
|
2009-12-21 03:26:15 +01:00
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val
|
|
|
|
|
|
FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b)
|
|
|
|
|
|
WHERE t1.a=t2.a;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 2 Using index
|
|
|
|
|
|
1 SIMPLE t2 ref PRIMARY PRIMARY 8 test.t1.a 1 Using index
|
|
|
|
|
|
1 SIMPLE t3 ALL NULL NULL NULL NULL 24 Using where; Using join buffer
|
|
|
|
|
|
SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val
|
|
|
|
|
|
FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b)
|
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|
|
|
|
WHERE t1.a=t2.a;
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|
|
a a a b b val
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|
|
1 1 NULL 10 NULL NULL
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|
|
1 1 NULL 20 NULL NULL
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|
|
1 1 NULL 30 NULL NULL
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|
|
1 1 NULL 40 NULL NULL
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|
|
1 1 NULL 50 NULL NULL
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|
2 2 2 30 30 0
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|
2 2 2 40 40 0
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2 2 2 50 50 0
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2 2 2 60 60 0
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|
2 2 2 70 70 0
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|
|
2 2 2 80 80 0
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|
|
set join_buffer_size=default;
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|
|
|
|
set join_cache_level=default;
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|
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|
|
DROP TABLE t1,t2,t3;
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|
|
create table t1(f1 int, f2 int);
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insert into t1 values (1,1),(2,2),(3,3);
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|
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create table t2(f1 int not null, f2 int not null, f3 char(200), key(f1,f2));
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insert into t2 values (1,1, 'qwerty'),(1,2, 'qwerty'),(1,3, 'qwerty');
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insert into t2 values (2,1, 'qwerty'),(2,2, 'qwerty'),(2,3, 'qwerty'),
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|
|
(2,4, 'qwerty'),(2,5, 'qwerty');
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|
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insert into t2 values (3,1, 'qwerty'),(3,4, 'qwerty');
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|
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insert into t2 values (4,1, 'qwerty'),(4,2, 'qwerty'),(4,3, 'qwerty'),
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|
|
(4,4, 'qwerty');
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|
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insert into t2 values (1,1, 'qwerty'),(1,2, 'qwerty'),(1,3, 'qwerty');
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|
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insert into t2 values (2,1, 'qwerty'),(2,2, 'qwerty'),(2,3, 'qwerty'),
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|
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(2,4, 'qwerty'),(2,5, 'qwerty');
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|
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insert into t2 values (3,1, 'qwerty'),(3,4, 'qwerty');
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|
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insert into t2 values (4,1, 'qwerty'),(4,2, 'qwerty'),(4,3, 'qwerty'),
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|
|
(4,4, 'qwerty');
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|
|
set join_cache_level=5;
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|
|
select t2.f1, t2.f2, t2.f3 from t1,t2
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|
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where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
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|
|
f1 f2 f3
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|
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1 1 qwerty
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|
|
2 2 qwerty
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|
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|
|
1 1 qwerty
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|
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|
|
2 2 qwerty
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|
|
|
|
|
explain select t2.f1, t2.f2, t2.f3 from t1,t2
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|
|
|
|
|
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
|
|
|
|
|
1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using join buffer
|
|
|
|
|
|
set join_cache_level=6;
|
|
|
|
|
|
select t2.f1, t2.f2, t2.f3 from t1,t2
|
|
|
|
|
|
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
|
|
|
|
|
|
f1 f2 f3
|
|
|
|
|
|
1 1 qwerty
|
|
|
|
|
|
2 2 qwerty
|
|
|
|
|
|
1 1 qwerty
|
|
|
|
|
|
2 2 qwerty
|
|
|
|
|
|
explain select t2.f1, t2.f2, t2.f3 from t1,t2
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|
|
|
|
|
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
|
|
|
|
|
1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using join buffer
|
|
|
|
|
|
set join_cache_level=7;
|
|
|
|
|
|
select t2.f1, t2.f2, t2.f3 from t1,t2
|
|
|
|
|
|
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
|
|
|
|
|
|
f1 f2 f3
|
|
|
|
|
|
1 1 qwerty
|
|
|
|
|
|
2 2 qwerty
|
|
|
|
|
|
1 1 qwerty
|
|
|
|
|
|
2 2 qwerty
|
|
|
|
|
|
explain select t2.f1, t2.f2, t2.f3 from t1,t2
|
|
|
|
|
|
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
|
|
|
|
|
1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using join buffer
|
|
|
|
|
|
set join_cache_level=8;
|
|
|
|
|
|
select t2.f1, t2.f2, t2.f3 from t1,t2
|
|
|
|
|
|
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
|
|
|
|
|
|
f1 f2 f3
|
|
|
|
|
|
1 1 qwerty
|
|
|
|
|
|
2 2 qwerty
|
|
|
|
|
|
1 1 qwerty
|
|
|
|
|
|
2 2 qwerty
|
|
|
|
|
|
explain select t2.f1, t2.f2, t2.f3 from t1,t2
|
|
|
|
|
|
where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
|
|
|
|
|
|
1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using join buffer
|
|
|
|
|
|
drop table t1,t2;
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
#
|
|
|
|
|
|
# Bug #42955: join with GROUP BY/ORDER BY and when BKA is enabled
|
|
|
|
|
|
#
|
|
|
|
|
|
create table t1 (d int, id1 int, index idx1 (d, id1));
|
|
|
|
|
|
insert into t1 values
|
|
|
|
|
|
(3, 20), (2, 40), (3, 10), (1, 10), (3, 20), (1, 40), (2, 30), (3, 30);
|
|
|
|
|
|
create table t2 (id1 int, id2 int, index idx2 (id1));
|
|
|
|
|
|
insert into t2 values
|
|
|
|
|
|
(20, 100), (30, 400), (20, 400), (30, 200), (10, 300), (10, 200), (40, 100),
|
|
|
|
|
|
(40, 200), (30, 300), (10, 400), (20, 200), (20, 300);
|
|
|
|
|
|
set join_cache_level=6;
|
|
|
|
|
|
explain
|
|
|
|
|
|
select t1.id1, sum(t2.id2) from t1 join t2 on t1.id1=t2.id1
|
|
|
|
|
|
where t1.d=3 group by t1.id1;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ref idx1 idx1 5 const 4 Using index; Using temporary; Using filesort
|
|
|
|
|
|
1 SIMPLE t2 ref idx2 idx2 5 test.t1.id1 2 Using join buffer
|
|
|
|
|
|
select t1.id1, sum(t2.id2) from t1 join t2 on t1.id1=t2.id1
|
|
|
|
|
|
where t1.d=3 group by t1.id1;
|
|
|
|
|
|
id1 sum(t2.id2)
|
|
|
|
|
|
10 900
|
|
|
|
|
|
20 2000
|
|
|
|
|
|
30 900
|
|
|
|
|
|
explain
|
|
|
|
|
|
select t1.id1 from t1 join t2 on t1.id1=t2.id1
|
|
|
|
|
|
where t1.d=3 and t2.id2 > 200 order by t1.id1;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ref idx1 idx1 5 const 4 Using index; Using temporary; Using filesort
|
|
|
|
|
|
1 SIMPLE t2 ref idx2 idx2 5 test.t1.id1 2 Using where; Using join buffer
|
|
|
|
|
|
select t1.id1 from t1 join t2 on t1.id1=t2.id1
|
|
|
|
|
|
where t1.d=3 and t2.id2 > 200 order by t1.id1;
|
|
|
|
|
|
id1
|
|
|
|
|
|
10
|
|
|
|
|
|
10
|
|
|
|
|
|
20
|
|
|
|
|
|
20
|
|
|
|
|
|
20
|
|
|
|
|
|
20
|
|
|
|
|
|
30
|
|
|
|
|
|
30
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
drop table t1,t2;
|
|
|
|
|
|
#
|
|
|
|
|
|
# Bug #44019: star-like multi-join query executed join_cache_level=6
|
|
|
|
|
|
#
|
|
|
|
|
|
create table t1 (a int, b int, c int, d int);
|
|
|
|
|
|
create table t2 (b int, e varchar(16), index idx(b));
|
|
|
|
|
|
create table t3 (d int, f varchar(16), index idx(d));
|
|
|
|
|
|
create table t4 (c int, g varchar(16), index idx(c));
|
|
|
|
|
|
insert into t1 values
|
|
|
|
|
|
(5, 50, 500, 5000), (3, 30, 300, 3000), (9, 90, 900, 9000),
|
|
|
|
|
|
(2, 20, 200, 2000), (4, 40, 400, 4000), (8, 80, 800, 800),
|
|
|
|
|
|
(7, 70, 700, 7000);
|
|
|
|
|
|
insert into t2 values
|
|
|
|
|
|
(30, 'bbb'), (10, 'b'), (70, 'bbbbbbb'), (60, 'bbbbbb'),
|
|
|
|
|
|
(31, 'bbb'), (11, 'b'), (71, 'bbbbbbb'), (61, 'bbbbbb'),
|
|
|
|
|
|
(32, 'bbb'), (12, 'b'), (72, 'bbbbbbb'), (62, 'bbbbbb');
|
|
|
|
|
|
insert into t3 values
|
|
|
|
|
|
(4000, 'dddd'), (3000, 'ddd'), (1000, 'd'), (8000, 'dddddddd'),
|
|
|
|
|
|
(4001, 'dddd'), (3001, 'ddd'), (1001, 'd'), (8001, 'dddddddd'),
|
|
|
|
|
|
(4002, 'dddd'), (3002, 'ddd'), (1002, 'd'), (8002, 'dddddddd');
|
|
|
|
|
|
insert into t4 values
|
|
|
|
|
|
(200, 'cc'), (600, 'cccccc'), (300, 'ccc'), (500, 'ccccc'),
|
|
|
|
|
|
(201, 'cc'), (601, 'cccccc'), (301, 'ccc'), (501, 'ccccc'),
|
|
|
|
|
|
(202, 'cc'), (602, 'cccccc'), (302, 'ccc'), (502, 'ccccc');
|
|
|
|
|
|
analyze table t2,t3,t4;
|
|
|
|
|
|
set join_cache_level=1;
|
|
|
|
|
|
explain
|
|
|
|
|
|
select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
|
|
|
|
|
|
where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 7
|
|
|
|
|
|
1 SIMPLE t2 ref idx idx 5 test.t1.b 1
|
|
|
|
|
|
1 SIMPLE t3 ref idx idx 5 test.t1.d 1
|
|
|
|
|
|
1 SIMPLE t4 ref idx idx 5 test.t1.c 1
|
|
|
|
|
|
select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
|
|
|
|
|
|
where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
|
|
|
|
|
|
a b c d e f g
|
|
|
|
|
|
3 30 300 3000 bbb ddd ccc
|
|
|
|
|
|
set join_cache_level=6;
|
|
|
|
|
|
explain
|
|
|
|
|
|
select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
|
|
|
|
|
|
where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 7
|
|
|
|
|
|
1 SIMPLE t2 ref idx idx 5 test.t1.b 1 Using join buffer
|
|
|
|
|
|
1 SIMPLE t3 ref idx idx 5 test.t1.d 1 Using join buffer
|
|
|
|
|
|
1 SIMPLE t4 ref idx idx 5 test.t1.c 1 Using join buffer
|
|
|
|
|
|
select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
|
|
|
|
|
|
where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
|
|
|
|
|
|
a b c d e f g
|
|
|
|
|
|
3 30 300 3000 bbb ddd ccc
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
drop table t1,t2,t3,t4;
|
|
|
|
|
|
#
|
|
|
|
|
|
# Bug #44250: Corruption of linked join buffers when using BKA
|
|
|
|
|
|
#
|
|
|
|
|
|
CREATE TABLE t1 (
|
|
|
|
|
|
id1 bigint(20) DEFAULT NULL,
|
|
|
|
|
|
id2 bigint(20) DEFAULT NULL,
|
|
|
|
|
|
id3 bigint(20) DEFAULT NULL,
|
|
|
|
|
|
num1 bigint(20) DEFAULT NULL,
|
|
|
|
|
|
num2 int(11) DEFAULT NULL,
|
|
|
|
|
|
num3 bigint(20) DEFAULT NULL
|
|
|
|
|
|
);
|
|
|
|
|
|
CREATE TABLE t2 (
|
|
|
|
|
|
id3 bigint(20) NOT NULL DEFAULT '0',
|
|
|
|
|
|
id4 bigint(20) DEFAULT NULL,
|
|
|
|
|
|
enum1 enum('Enabled','Disabled','Paused') DEFAULT NULL,
|
|
|
|
|
|
PRIMARY KEY (id3)
|
|
|
|
|
|
);
|
|
|
|
|
|
CREATE TABLE t3 (
|
|
|
|
|
|
id4 bigint(20) NOT NULL DEFAULT '0',
|
|
|
|
|
|
text1 text,
|
|
|
|
|
|
PRIMARY KEY (id4)
|
|
|
|
|
|
);
|
|
|
|
|
|
CREATE TABLE t4 (
|
|
|
|
|
|
id2 bigint(20) NOT NULL DEFAULT '0',
|
|
|
|
|
|
dummy int(11) DEFAULT '0',
|
|
|
|
|
|
PRIMARY KEY (id2)
|
|
|
|
|
|
);
|
|
|
|
|
|
CREATE TABLE t5 (
|
|
|
|
|
|
id1 bigint(20) NOT NULL DEFAULT '0',
|
|
|
|
|
|
id2 bigint(20) NOT NULL DEFAULT '0',
|
|
|
|
|
|
enum2 enum('Active','Deleted','Paused') DEFAULT NULL,
|
|
|
|
|
|
PRIMARY KEY (id1,id2)
|
|
|
|
|
|
);
|
|
|
|
|
|
set join_cache_level=8;
|
|
|
|
|
|
set join_buffer_size=2048;
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT STRAIGHT_JOIN t1.id1, t1.num3, t3.text1, t3.id4, t2.id3, t4.dummy
|
|
|
|
|
|
FROM t1 JOIN t2 JOIN t3 JOIN t4 JOIN t5
|
|
|
|
|
|
WHERE t1.id1=t5.id1 AND t1.id2=t5.id2 and t4.id2=t1.id2 AND
|
|
|
|
|
|
t5.enum2='Active' AND t3.id4=t2.id4 AND t2.id3=t1.id3 AND t3.text1<'D';
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 349
|
|
|
|
|
|
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 8 test.t1.id3 1 Using join buffer
|
|
|
|
|
|
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 8 test.t2.id4 1 Using where; Using join buffer
|
|
|
|
|
|
1 SIMPLE t4 eq_ref PRIMARY PRIMARY 8 test.t1.id2 1 Using join buffer
|
|
|
|
|
|
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 16 test.t1.id1,test.t1.id2 1 Using where; Using join buffer
|
|
|
|
|
|
SELECT STRAIGHT_JOIN t1.id1, t1.num3, t3.text1, t3.id4, t2.id3, t4.dummy
|
|
|
|
|
|
FROM t1 JOIN t2 JOIN t3 JOIN t4 JOIN t5
|
|
|
|
|
|
WHERE t1.id1=t5.id1 AND t1.id2=t5.id2 and t4.id2=t1.id2 AND
|
|
|
|
|
|
t5.enum2='Active' AND t3.id4=t2.id4 AND t2.id3=t1.id3 AND t3.text1<'D';
|
|
|
|
|
|
id1 num3 text1 id4 id3 dummy
|
|
|
|
|
|
228172702 14 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0
|
2010-08-31 18:34:21 +02:00
|
|
|
|
228172702 134 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0
|
2009-12-21 03:26:15 +01:00
|
|
|
|
228172702 15 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0
|
|
|
|
|
|
228172702 3 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0
|
|
|
|
|
|
228808822 61 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
|
|
|
|
|
228808822 13 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
|
|
|
|
|
228808822 60 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
|
|
|
|
|
228808822 13 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
|
|
|
|
|
228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
|
|
|
|
|
228808822 4 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
|
|
|
|
|
228808822 6 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
|
|
|
|
|
228808822 18 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
|
|
|
|
|
228808822 1 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
|
|
|
|
|
228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
|
|
|
|
|
228808822 4 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
2010-08-31 18:34:21 +02:00
|
|
|
|
228808822 17 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
|
|
|
|
|
228808822 50 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
|
2009-12-21 03:26:15 +01:00
|
|
|
|
228808822 89 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
|
|
|
|
|
228808822 19 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
2010-08-31 18:34:21 +02:00
|
|
|
|
228808822 9 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
2009-12-21 03:26:15 +01:00
|
|
|
|
228808822 84 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
|
|
|
|
|
228808822 14 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
|
|
|
|
|
228808822 1 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
|
|
|
|
|
228808822 10 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
|
|
|
|
|
228808822 26 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
|
|
|
|
|
228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
|
|
|
|
|
228808822 1 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
2010-08-31 18:34:21 +02:00
|
|
|
|
228808822 4 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
2009-12-21 03:26:15 +01:00
|
|
|
|
228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
|
|
|
|
|
228808822 28 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
|
|
|
|
|
228808822 62 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
|
|
|
|
|
|
set join_buffer_size=default;
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
DROP TABLE t1,t2,t3,t4,t5;
|
|
|
|
|
|
#
|
|
|
|
|
|
# Bug#45267: Incomplete check caused wrong result.
|
|
|
|
|
|
#
|
|
|
|
|
|
CREATE TABLE t1 (
|
|
|
|
|
|
`pk` int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY
|
|
|
|
|
|
);
|
|
|
|
|
|
CREATE TABLE t3 (
|
|
|
|
|
|
`pk` int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY
|
|
|
|
|
|
);
|
|
|
|
|
|
INSERT INTO t3 VALUES
|
|
|
|
|
|
(1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12),(13),(14),(15),
|
|
|
|
|
|
(16),(17),(18),(19),(20);
|
|
|
|
|
|
CREATE TABLE t2 (
|
|
|
|
|
|
`pk` int(11) NOT NULL AUTO_INCREMENT,
|
|
|
|
|
|
`int_nokey` int(11) NOT NULL,
|
|
|
|
|
|
`time_key` time NOT NULL,
|
|
|
|
|
|
PRIMARY KEY (`pk`),
|
|
|
|
|
|
KEY `time_key` (`time_key`)
|
|
|
|
|
|
);
|
|
|
|
|
|
INSERT INTO t2 VALUES (10,9,'22:36:46'),(11,0,'08:46:46');
|
|
|
|
|
|
SELECT DISTINCT t1.`pk`
|
|
|
|
|
|
FROM t1 RIGHT JOIN t2 STRAIGHT_JOIN t3 ON t2.`int_nokey` ON t2.`time_key`
|
|
|
|
|
|
GROUP BY 1;
|
|
|
|
|
|
pk
|
|
|
|
|
|
NULL
|
|
|
|
|
|
DROP TABLE IF EXISTS t1, t2, t3;
|
|
|
|
|
|
#
|
|
|
|
|
|
# Bug #46328: Use of aggregate function without GROUP BY clause
|
|
|
|
|
|
# returns many rows (vs. one )
|
|
|
|
|
|
#
|
|
|
|
|
|
CREATE TABLE t1 (
|
|
|
|
|
|
int_key int(11) NOT NULL,
|
|
|
|
|
|
KEY int_key (int_key)
|
|
|
|
|
|
);
|
|
|
|
|
|
INSERT INTO t1 VALUES
|
|
|
|
|
|
(0),(2),(2),(2),(3),(4),(5),(5),(6),(6),(8),(8),(9),(9);
|
|
|
|
|
|
CREATE TABLE t2 (
|
|
|
|
|
|
int_key int(11) NOT NULL,
|
|
|
|
|
|
KEY int_key (int_key)
|
|
|
|
|
|
);
|
|
|
|
|
|
INSERT INTO t2 VALUES (2),(3);
|
|
|
|
|
|
|
|
|
|
|
|
# The query shall return 1 record with a max value 9 and one of the
|
|
|
|
|
|
# int_key values inserted above (undefined which one). A changed
|
|
|
|
|
|
# execution plan may change the value in the second column
|
|
|
|
|
|
SELECT MAX(t1.int_key), t1.int_key
|
|
|
|
|
|
FROM t1 STRAIGHT_JOIN t2
|
|
|
|
|
|
ORDER BY t1.int_key;
|
|
|
|
|
|
MAX(t1.int_key) int_key
|
|
|
|
|
|
9 0
|
|
|
|
|
|
|
|
|
|
|
|
explain
|
|
|
|
|
|
SELECT MAX(t1.int_key), t1.int_key
|
|
|
|
|
|
FROM t1 STRAIGHT_JOIN t2
|
|
|
|
|
|
ORDER BY t1.int_key;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 index NULL int_key 4 NULL 14 Using index
|
|
|
|
|
|
1 SIMPLE t2 index NULL int_key 4 NULL 2 Using index; Using join buffer
|
|
|
|
|
|
|
|
|
|
|
|
DROP TABLE t1,t2;
|
|
|
|
|
|
SET join_cache_level=default;
|
|
|
|
|
|
#
|
|
|
|
|
|
# Regression test for
|
|
|
|
|
|
# Bug#46733 - NULL value not returned for aggregate on empty result
|
|
|
|
|
|
# set w/ semijoin on
|
|
|
|
|
|
#
|
|
|
|
|
|
CREATE TABLE t1 (
|
|
|
|
|
|
i int(11) NOT NULL,
|
|
|
|
|
|
v varchar(1) DEFAULT NULL,
|
|
|
|
|
|
PRIMARY KEY (i)
|
|
|
|
|
|
);
|
|
|
|
|
|
INSERT INTO t1 VALUES (10,'a'),(11,'b'),(12,'c'),(13,'d');
|
|
|
|
|
|
CREATE TABLE t2 (
|
|
|
|
|
|
i int(11) NOT NULL,
|
|
|
|
|
|
v varchar(1) DEFAULT NULL,
|
|
|
|
|
|
PRIMARY KEY (i)
|
|
|
|
|
|
);
|
|
|
|
|
|
INSERT INTO t2 VALUES (1,'x'),(2,'y');
|
|
|
|
|
|
|
|
|
|
|
|
SELECT MAX(t1.i)
|
|
|
|
|
|
FROM t1 JOIN t2 ON t2.v
|
|
|
|
|
|
ORDER BY t2.v;
|
|
|
|
|
|
MAX(t1.i)
|
|
|
|
|
|
NULL
|
|
|
|
|
|
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT MAX(t1.i)
|
|
|
|
|
|
FROM t1 JOIN t2 ON t2.v
|
|
|
|
|
|
ORDER BY t2.v;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where
|
|
|
|
|
|
1 SIMPLE t1 index NULL PRIMARY 4 NULL 4 Using index; Using join buffer
|
|
|
|
|
|
|
|
|
|
|
|
DROP TABLE t1,t2;
|
|
|
|
|
|
#
|
|
|
|
|
|
# Bug #45092: join buffer contains two blob columns one of which is
|
|
|
|
|
|
# used in the key employed to access the joined table
|
|
|
|
|
|
#
|
|
|
|
|
|
CREATE TABLE t1 (c1 int, c2 int, key (c2));
|
|
|
|
|
|
INSERT INTO t1 VALUES (1,1);
|
|
|
|
|
|
INSERT INTO t1 VALUES (2,2);
|
|
|
|
|
|
CREATE TABLE t2 (c1 text, c2 text);
|
|
|
|
|
|
INSERT INTO t2 VALUES('tt', 'uu');
|
|
|
|
|
|
INSERT INTO t2 VALUES('zzzz', 'xxxxxxxxx');
|
|
|
|
|
|
ANALYZE TABLE t1,t2;
|
|
|
|
|
|
set join_cache_level=6;
|
|
|
|
|
|
SELECT t1.*, t2.*, LENGTH(t2.c1), LENGTH(t2.c2) FROM t1,t2
|
|
|
|
|
|
WHERE t1.c2=LENGTH(t2.c2) and t1.c1=LENGTH(t2.c1);
|
|
|
|
|
|
c1 c2 c1 c2 LENGTH(t2.c1) LENGTH(t2.c2)
|
|
|
|
|
|
2 2 tt uu 2 2
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
DROP TABLE t1,t2;
|
2010-03-06 20:14:55 +01:00
|
|
|
|
#
|
|
|
|
|
|
# Bug #51092: linked join buffer is used for a 3-way cross join query
|
|
|
|
|
|
# that selects only records of the first table
|
|
|
|
|
|
#
|
|
|
|
|
|
create table t1 (a int, b int);
|
|
|
|
|
|
insert into t1 values (1,1),(2,2);
|
|
|
|
|
|
create table t2 (a int, b int);
|
|
|
|
|
|
insert into t2 values (1,1),(2,2);
|
|
|
|
|
|
create table t3 (a int, b int);
|
|
|
|
|
|
insert into t3 values (1,1),(2,2);
|
|
|
|
|
|
explain select t1.* from t1,t2,t3;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
|
|
|
|
|
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using join buffer
|
|
|
|
|
|
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 Using join buffer
|
|
|
|
|
|
select t1.* from t1,t2,t3;
|
|
|
|
|
|
a b
|
|
|
|
|
|
1 1
|
|
|
|
|
|
2 2
|
|
|
|
|
|
1 1
|
|
|
|
|
|
2 2
|
|
|
|
|
|
1 1
|
|
|
|
|
|
2 2
|
|
|
|
|
|
1 1
|
|
|
|
|
|
2 2
|
|
|
|
|
|
set join_cache_level=2;
|
|
|
|
|
|
explain select t1.* from t1,t2,t3;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
|
|
|
|
|
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using join buffer
|
|
|
|
|
|
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 Using join buffer
|
|
|
|
|
|
select t1.* from t1,t2,t3;
|
|
|
|
|
|
a b
|
|
|
|
|
|
1 1
|
|
|
|
|
|
2 2
|
|
|
|
|
|
1 1
|
|
|
|
|
|
2 2
|
|
|
|
|
|
1 1
|
|
|
|
|
|
2 2
|
|
|
|
|
|
1 1
|
|
|
|
|
|
2 2
|
|
|
|
|
|
set join_cache_level=default;
|
|
|
|
|
|
drop table t1,t2,t3;
|
2010-08-31 18:34:21 +02:00
|
|
|
|
set @@optimizer_switch=@save_optimizer_switch;
|
2010-09-22 01:41:53 +02:00
|
|
|
|
#
|
|
|
|
|
|
# Bug #52394: using join buffer for 3 table join with ref access
|
|
|
|
|
|
# LP #623209: and no references to the columns of the middle table
|
|
|
|
|
|
#
|
|
|
|
|
|
set join_cache_level=6;
|
|
|
|
|
|
CREATE TABLE t1 (a int(11), b varchar(1));
|
|
|
|
|
|
INSERT INTO t1 VALUES (6,'r'),(27,'o');
|
|
|
|
|
|
CREATE TABLE t2(a int);
|
|
|
|
|
|
INSERT INTO t2 VALUES(1),(2),(3),(4),(5);
|
|
|
|
|
|
CREATE TABLE t3 (a int(11) primary key, b varchar(1));
|
|
|
|
|
|
INSERT INTO t3 VALUES
|
|
|
|
|
|
(14,'d'),(15,'z'),(16,'e'),(17,'h'),(18,'b'),(19,'s'),(20,'e'),
|
|
|
|
|
|
(21,'j'),(22,'e'),(23,'f'),(24,'v'),(25,'x'),(26,'m'),(27,'o');
|
|
|
|
|
|
EXPLAIN
|
|
|
|
|
|
SELECT t3.a FROM t1,t2,t3 WHERE t1.a = t3.a AND t1.b = t3.b;
|
|
|
|
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
|
|
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
|
|
|
|
|
|
1 SIMPLE t2 ALL NULL NULL NULL NULL 5 Using join buffer
|
|
|
|
|
|
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using join buffer
|
|
|
|
|
|
SELECT t3.a FROM t1,t2,t3 WHERE t1.a = t3.a AND t1.b = t3.b;
|
|
|
|
|
|
a
|
|
|
|
|
|
27
|
|
|
|
|
|
27
|
|
|
|
|
|
27
|
|
|
|
|
|
27
|
|
|
|
|
|
27
|
|
|
|
|
|
DROP TABLE t1,t2,t3;
|
|
|
|
|
|
set join_cache_level=default;
|
