mirror of
https://github.com/MariaDB/server.git
synced 2025-01-17 12:32:27 +01:00
33efc9677d
Fixed (together with Guilhem) bugs in mysqlbinlog regarding --offset Prefix addresses with 0x for easier comparisons of debug logs Fixed problem where MySQL choosed index-read even if there would be a much better range on the same index This fix changed some 'index' queries to 'range' queries in the test suite Don't create 'dummy' WHERE clause for trivial WHERE clauses where we can remove the WHERE clause. This fix removed of a lot of 'Using where' notes in the test suite. Give NOTE instead of WARNING if table/function doesn't exists when using DROP IF EXISTS Give NOTE instead of WARNING for safe field-type conversions Makefile.am: Don't automaticly update files from bk client/mysqlbinlog.cc: Merge with 4.1 (+ apply bug fixes for --offset and --start-position) include/my_sys.h: Faster clear_alloc_root() mysql-test/r/bdb.result: Updated results after merge mysql-test/r/create.result: Updated results after merge mysql-test/r/func_group.result: Updated results after merge mysql-test/r/func_if.result: Updated results after merge mysql-test/r/heap_btree.result: Updated results after merge mysql-test/r/index_merge.result: Updated results after merge mysql-test/r/index_merge_ror.result: Updated results after merge mysql-test/r/innodb.result: Updated results after merge mysql-test/r/join_outer.result: Updated results after merge mysql-test/r/mysqlbinlog2.result: Updated results after merge mysql-test/r/negation_elimination.result: Updated results after merge mysql-test/r/null.result: Updated results after merge Added more tests mysql-test/r/null_key.result: Updated results after merge Added more tests mysql-test/r/order_by.result: Updated results after merge mysql-test/r/range.result: Updated results after merge Added more tests mysql-test/r/rpl_charset.result: Updated results after merge mysql-test/r/sp-error.result: Updated results after merge mysql-test/r/sp.result: Updated results after merge Added delete of some stored procedures in an attempt to be able to re-run test even if it aborts in the middle mysql-test/r/type_blob.result: Updated results after merge (Some warnings are now notes) mysql-test/r/user_var.result: Updated results after merge Added more tests mysql-test/r/variables.result: Updated results after merge mysql-test/r/view.result: Updated results after merge mysql-test/t/mysqlbinlog2.test: Updated tests to use new positions mysql-test/t/null.test: More tests mysql-test/t/null_key.test: More tests mysql-test/t/range.test: More tests mysql-test/t/rpl_charset.test: Avoid big diffs in the future if tests changes mysql-test/t/sp-error.test: Updated error numbers mysql-test/t/sp-security.test: Updated error numbers mysql-test/t/sp.test: Updated results after merge Added delete of some stored procedures in an attempt to be able to re-run test even if it aborts in the middle mysql-test/t/user_var.test: More tests mysql-test/t/view.test: Updated error numbers mysys/my_alloc.c: Write into debug log the address of the allocated area sql/ha_isam.cc: Prefix addresses with 0x for easier comparisons of debug logs sql/ha_myisam.cc: Prefix addresses with 0x for easier comparisons of debug logs sql/ha_ndbcluster.cc: Add missing enum to switch sql/handler.cc: remove compiler warning sql/item.cc: More debugging Simple cleanup sql/item.h: Move Item::cleanup() to item.cc sql/item_cmpfunc.cc: Fix arena code sql/item_subselect.cc: After merge fixes sql/item_subselect.h: After merge fixes sql/item_sum.cc: Updated comment sql/log_event.cc: Remove wrong test sql/mysql_priv.h: Indentation fixes sql/mysqld.cc: After merge fixes Added 0x to pointers in debug log sql/opt_range.cc: Fixed problem where MySQL choosed index-read even if there would be a much better range on the same index This fix changed some 'index' queries to 'range' queries in the test suite sql/set_var.cc: Indentation fixes sql/sp_head.cc: Set state to INITIALIZED to make SP work with new arena code sql/sql_base.cc: After merge fixes sql/sql_class.cc: More debugging Use clear_alloc_root() instead of init_alloc_root() as the former is faster sql/sql_class.h: New method 'only_prepare()' sql/sql_lex.cc: After merge fixes sql/sql_lex.h: After merge fixes sql/sql_parse.cc: Fix for timezone tables. (The old way to add timezone tables to global list in 'create_total_list' doesn't work anymore) Give NOTE instead of WARNING if table/function doesn't exists when using DROP IF EXISTS sql/sql_prepare.cc: After merge fixes sql/sql_select.cc: Don't create 'dummy' WHERE clause for trivial WHERE clauses where we can remove the WHERE clause. This fix removed of a lot of 'Using where' notes in the test suite sql/sql_table.cc: Give NOTE instead of WARNING if table/function doesn't exists when using DROP IF EXISTS sql/sql_union.cc: After merge fix sql/sql_view.cc: After merge fix sql/table.cc: After merge fix sql/tztime.cc: Update timezone table handling to use new table lists structure sql/tztime.h: Update timezone table handling to use new table lists structure sql/unireg.cc: Use 0x before pointers
725 lines
23 KiB
Text
725 lines
23 KiB
Text
drop table if exists t1,t2,t3;
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CREATE TABLE t1 (
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id int(6) DEFAULT '0' NOT NULL,
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idservice int(5),
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clee char(20) NOT NULL,
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flag char(1),
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KEY id (id),
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PRIMARY KEY (clee)
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);
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INSERT INTO t1 VALUES (2,4,'6067169d','Y');
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INSERT INTO t1 VALUES (2,5,'606716d1','Y');
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INSERT INTO t1 VALUES (2,1,'606717c1','Y');
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INSERT INTO t1 VALUES (3,1,'6067178d','Y');
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INSERT INTO t1 VALUES (2,6,'60671515','Y');
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INSERT INTO t1 VALUES (2,7,'60671569','Y');
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INSERT INTO t1 VALUES (2,3,'dd','Y');
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CREATE TABLE t2 (
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id int(6) NOT NULL auto_increment,
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description varchar(40) NOT NULL,
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idform varchar(40),
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ordre int(6) unsigned DEFAULT '0' NOT NULL,
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image varchar(60),
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PRIMARY KEY (id),
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KEY id (id,ordre)
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);
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INSERT INTO t2 VALUES (1,'Emettre un appel d''offres','en_construction.html',10,'emettre.gif');
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INSERT INTO t2 VALUES (2,'Emettre des soumissions','en_construction.html',20,'emettre.gif');
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INSERT INTO t2 VALUES (7,'Liste des t2','t2_liste_form.phtml',51060,'link.gif');
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INSERT INTO t2 VALUES (8,'Consulter les soumissions','consulter_soumissions.phtml',200,'link.gif');
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INSERT INTO t2 VALUES (9,'Ajouter un type de materiel','typeMateriel_ajoute_form.phtml',51000,'link.gif');
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INSERT INTO t2 VALUES (10,'Lister/modifier un type de materiel','typeMateriel_liste_form.phtml',51010,'link.gif');
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INSERT INTO t2 VALUES (3,'Créer une fiche de client','clients_ajoute_form.phtml',40000,'link.gif');
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INSERT INTO t2 VALUES (4,'Modifier des clients','en_construction.html',40010,'link.gif');
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INSERT INTO t2 VALUES (5,'Effacer des clients','en_construction.html',40020,'link.gif');
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INSERT INTO t2 VALUES (6,'Ajouter un service','t2_ajoute_form.phtml',51050,'link.gif');
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select t1.id,t1.idservice,t2.ordre,t2.description from t1, t2 where t1.id = 2 and t1.idservice = t2.id order by t2.ordre;
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id idservice ordre description
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2 1 10 Emettre un appel d'offres
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2 3 40000 Créer une fiche de client
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2 4 40010 Modifier des clients
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2 5 40020 Effacer des clients
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2 6 51050 Ajouter un service
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2 7 51060 Liste des t2
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drop table t1,t2;
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create table t1 (first char(10),last char(10));
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insert into t1 values ("Michael","Widenius");
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insert into t1 values ("Allan","Larsson");
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insert into t1 values ("David","Axmark");
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select concat(first," ",last) as name from t1 order by name;
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name
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Allan Larsson
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David Axmark
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Michael Widenius
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select concat(last," ",first) as name from t1 order by name;
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name
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Axmark David
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Larsson Allan
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Widenius Michael
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drop table t1;
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create table t1 (i int);
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insert into t1 values(1),(2),(1),(2),(1),(2),(3);
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select distinct i from t1;
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i
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1
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2
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3
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select distinct i from t1 order by rand(5);
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i
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1
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3
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2
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select distinct i from t1 order by i desc;
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i
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3
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2
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1
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select distinct i from t1 order by 1-i;
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i
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3
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2
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1
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select distinct i from t1 order by mod(i,2),i;
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i
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2
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1
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3
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drop table t1;
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create table t1 ( pk int primary key, name varchar(255) not null, number varchar(255) not null);
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insert into t1 values (1, 'Gamma', '123'), (2, 'Gamma Ext', '123a'), (3, 'Alpha', '001'), (4, 'Beta', '200c');
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select distinct t1.name as 'Building Name',t1.number as 'Building Number' from t1 order by t1.name asc;
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Building Name Building Number
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Alpha 001
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Beta 200c
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Gamma 123
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Gamma Ext 123a
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drop table t1;
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create table t1 (id int not null,col1 int not null,col2 int not null,index(col1));
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insert into t1 values(1,2,2),(2,2,1),(3,1,2),(4,1,1),(5,1,4),(6,2,3),(7,3,1),(8,2,4);
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select * from t1 order by col1,col2;
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id col1 col2
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4 1 1
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3 1 2
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5 1 4
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2 2 1
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1 2 2
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6 2 3
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8 2 4
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7 3 1
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select col1 from t1 order by id;
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col1
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2
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2
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1
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1
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1
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2
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3
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2
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select col1 as id from t1 order by id;
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id
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1
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1
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1
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2
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2
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2
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2
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3
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select concat(col1) as id from t1 order by id;
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id
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1
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1
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1
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2
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2
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2
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2
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3
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drop table t1;
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CREATE TABLE t1 (id int auto_increment primary key,aika varchar(40),aikakentta timestamp);
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insert into t1 (aika) values ('Keskiviikko');
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insert into t1 (aika) values ('Tiistai');
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insert into t1 (aika) values ('Maanantai');
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insert into t1 (aika) values ('Sunnuntai');
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SELECT FIELD(SUBSTRING(t1.aika,1,2),'Ma','Ti','Ke','To','Pe','La','Su') AS test FROM t1 ORDER by test;
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test
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1
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2
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3
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7
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drop table t1;
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CREATE TABLE t1
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(
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a int unsigned NOT NULL,
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b int unsigned NOT NULL,
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c int unsigned NOT NULL,
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UNIQUE(a),
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INDEX(b),
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INDEX(c)
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);
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CREATE TABLE t2
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(
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c int unsigned NOT NULL,
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i int unsigned NOT NULL,
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INDEX(c)
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);
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CREATE TABLE t3
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(
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c int unsigned NOT NULL,
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v varchar(64),
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INDEX(c)
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);
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INSERT INTO t1 VALUES (1,1,1);
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INSERT INTO t1 VALUES (2,1,2);
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INSERT INTO t1 VALUES (3,2,1);
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INSERT INTO t1 VALUES (4,2,2);
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INSERT INTO t2 VALUES (1,50);
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INSERT INTO t2 VALUES (2,25);
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INSERT INTO t3 VALUES (1,'123 Park Place');
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INSERT INTO t3 VALUES (2,'453 Boardwalk');
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SELECT a,b,if(b = 1,i,if(b = 2,v,''))
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FROM t1
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LEFT JOIN t2 USING(c)
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LEFT JOIN t3 ON t3.c = t1.c;
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a b if(b = 1,i,if(b = 2,v,''))
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1 1 50
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2 1 25
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3 2 123 Park Place
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4 2 453 Boardwalk
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SELECT a,b,if(b = 1,i,if(b = 2,v,''))
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FROM t1
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LEFT JOIN t2 USING(c)
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LEFT JOIN t3 ON t3.c = t1.c
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ORDER BY a;
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a b if(b = 1,i,if(b = 2,v,''))
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1 1 50
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2 1 25
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3 2 123 Park Place
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4 2 453 Boardwalk
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drop table t1,t2,t3;
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create table t1 (ID int not null primary key, TransactionID int not null);
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insert into t1 (ID, TransactionID) values (1, 87), (2, 89), (3, 92), (4, 94), (5, 486), (6, 490), (7, 753), (9, 828), (10, 832), (11, 834), (12, 840);
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create table t2 (ID int not null primary key, GroupID int not null);
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insert into t2 (ID, GroupID) values (87, 87), (89, 89), (92, 92), (94, 94), (486, 486), (490, 490),(753, 753), (828, 828), (832, 832), (834, 834), (840, 840);
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create table t3 (ID int not null primary key, DateOfAction date not null);
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insert into t3 (ID, DateOfAction) values (87, '1999-07-19'), (89, '1999-07-19'), (92, '1999-07-19'), (94, '1999-07-19'), (486, '1999-07-18'), (490, '2000-03-27'), (753, '2000-03-28'), (828, '1999-07-27'), (832, '1999-07-27'),(834, '1999-07-27'), (840, '1999-07-27');
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select t3.DateOfAction, t1.TransactionID from t1 join t2 join t3 where t2.ID = t1.TransactionID and t3.ID = t2.GroupID order by t3.DateOfAction, t1.TransactionID;
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DateOfAction TransactionID
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1999-07-18 486
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1999-07-19 87
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1999-07-19 89
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1999-07-19 92
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1999-07-19 94
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1999-07-27 828
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1999-07-27 832
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1999-07-27 834
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1999-07-27 840
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2000-03-27 490
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2000-03-28 753
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select t3.DateOfAction, t1.TransactionID from t1 join t2 join t3 where t2.ID = t1.TransactionID and t3.ID = t2.GroupID order by t1.TransactionID,t3.DateOfAction;
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DateOfAction TransactionID
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1999-07-19 87
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1999-07-19 89
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1999-07-19 92
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1999-07-19 94
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1999-07-18 486
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2000-03-27 490
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2000-03-28 753
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1999-07-27 828
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1999-07-27 832
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1999-07-27 834
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1999-07-27 840
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drop table t1,t2,t3;
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CREATE TABLE t1 (
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member_id int(11) NOT NULL auto_increment,
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inschrijf_datum varchar(20) NOT NULL default '',
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lastchange_datum varchar(20) NOT NULL default '',
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nickname varchar(20) NOT NULL default '',
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password varchar(8) NOT NULL default '',
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voornaam varchar(30) NOT NULL default '',
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tussenvoegsels varchar(10) NOT NULL default '',
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achternaam varchar(50) NOT NULL default '',
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straat varchar(100) NOT NULL default '',
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postcode varchar(10) NOT NULL default '',
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wijk varchar(40) NOT NULL default '',
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plaats varchar(50) NOT NULL default '',
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telefoon varchar(10) NOT NULL default '',
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geboortedatum date NOT NULL default '0000-00-00',
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geslacht varchar(5) NOT NULL default '',
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email varchar(80) NOT NULL default '',
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uin varchar(15) NOT NULL default '',
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homepage varchar(100) NOT NULL default '',
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internet varchar(15) NOT NULL default '',
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scherk varchar(30) NOT NULL default '',
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favo_boek varchar(50) NOT NULL default '',
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favo_tijdschrift varchar(50) NOT NULL default '',
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favo_tv varchar(50) NOT NULL default '',
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favo_eten varchar(50) NOT NULL default '',
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favo_muziek varchar(30) NOT NULL default '',
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info text NOT NULL,
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ipnr varchar(30) NOT NULL default '',
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PRIMARY KEY (member_id)
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) ENGINE=MyISAM PACK_KEYS=1;
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insert into t1 (member_id) values (1),(2),(3);
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select member_id, nickname, voornaam FROM t1
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ORDER by lastchange_datum DESC LIMIT 2;
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member_id nickname voornaam
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1
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2
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drop table t1;
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create table t1 (a int not null, b int, c varchar(10), key (a, b, c));
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insert into t1 values (1, NULL, NULL), (1, NULL, 'b'), (1, 1, NULL), (1, 1, 'b'), (1, 1, 'b'), (2, 1, 'a'), (2, 1, 'b'), (2, 2, 'a'), (2, 2, 'b'), (2, 3, 'c'),(1,3,'b');
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explain select * from t1 where (a = 1 and b is null and c = 'b') or (a > 2) order by a desc;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index a a 20 NULL 11 Using where; Using index
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select * from t1 where (a = 1 and b is null and c = 'b') or (a > 2) order by a desc;
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a b c
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1 NULL b
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explain select * from t1 where a >= 1 and a < 3 order by a desc;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 4 NULL 10 Using where; Using index
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select * from t1 where a >= 1 and a < 3 order by a desc;
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a b c
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2 3 c
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2 2 b
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2 2 a
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2 1 b
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2 1 a
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1 3 b
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1 1 b
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1 1 b
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1 1 NULL
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1 NULL b
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1 NULL NULL
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explain select * from t1 where a = 1 order by a desc, b desc;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 4 const 5 Using where; Using index
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select * from t1 where a = 1 order by a desc, b desc;
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a b c
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1 3 b
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1 1 b
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1 1 b
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1 1 NULL
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1 NULL b
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1 NULL NULL
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explain select * from t1 where a = 1 and b is null order by a desc, b desc;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 9 const,const 2 Using where; Using index; Using filesort
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select * from t1 where a = 1 and b is null order by a desc, b desc;
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a b c
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1 NULL NULL
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1 NULL b
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explain select * from t1 where a >= 1 and a < 3 and b >0 order by a desc,b desc;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 9 NULL 8 Using where; Using index
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explain select * from t1 where a = 2 and b >0 order by a desc,b desc;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 9 NULL 5 Using where; Using index
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explain select * from t1 where a = 2 and b is null order by a desc,b desc;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 9 const,const 1 Using where; Using index; Using filesort
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explain select * from t1 where a = 2 and (b is null or b > 0) order by a
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desc,b desc;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 9 NULL 6 Using where; Using index
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explain select * from t1 where a = 2 and b > 0 order by a desc,b desc;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 9 NULL 5 Using where; Using index
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explain select * from t1 where a = 2 and b < 2 order by a desc,b desc;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 9 NULL 2 Using where; Using index
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explain select * from t1 where a = 1 order by b desc;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref a a 4 const 5 Using where; Using index
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select * from t1 where a = 1 order by b desc;
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a b c
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1 3 b
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1 1 b
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1 1 b
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1 1 NULL
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1 NULL b
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1 NULL NULL
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alter table t1 modify b int not null, modify c varchar(10) not null;
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Warnings:
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Warning 1265 Data truncated for column 'b' at row 1
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Warning 1265 Data truncated for column 'c' at row 1
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Warning 1265 Data truncated for column 'b' at row 2
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Warning 1265 Data truncated for column 'c' at row 3
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explain select * from t1 order by a, b, c;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL a 18 NULL 11 Using index
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select * from t1 order by a, b, c;
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a b c
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1 0
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1 0 b
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1 1
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1 1 b
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1 1 b
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1 3 b
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2 1 a
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2 1 b
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2 2 a
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2 2 b
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2 3 c
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explain select * from t1 order by a desc, b desc, c desc;
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id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index NULL a 18 NULL 11 Using index
|
|
select * from t1 order by a desc, b desc, c desc;
|
|
a b c
|
|
2 3 c
|
|
2 2 b
|
|
2 2 a
|
|
2 1 b
|
|
2 1 a
|
|
1 3 b
|
|
1 1 b
|
|
1 1 b
|
|
1 1
|
|
1 0 b
|
|
1 0
|
|
explain select * from t1 where (a = 1 and b = 1 and c = 'b') or (a > 2) order by a desc;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 range a a 18 NULL 3 Using where; Using index
|
|
select * from t1 where (a = 1 and b = 1 and c = 'b') or (a > 2) order by a desc;
|
|
a b c
|
|
1 1 b
|
|
1 1 b
|
|
explain select * from t1 where a < 2 and b <= 1 order by a desc, b desc;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 range a a 4 NULL 6 Using where; Using index
|
|
select * from t1 where a < 2 and b <= 1 order by a desc, b desc;
|
|
a b c
|
|
1 1 b
|
|
1 1 b
|
|
1 1
|
|
1 0 b
|
|
1 0
|
|
select count(*) from t1 where a < 5 and b > 0;
|
|
count(*)
|
|
9
|
|
select * from t1 where a < 5 and b > 0 order by a desc,b desc;
|
|
a b c
|
|
2 3 c
|
|
2 2 b
|
|
2 2 a
|
|
2 1 b
|
|
2 1 a
|
|
1 3 b
|
|
1 1 b
|
|
1 1 b
|
|
1 1
|
|
explain select * from t1 where a between 1 and 3 and b <= 1 order by a desc, b desc;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 range a a 8 NULL 10 Using where; Using index
|
|
select * from t1 where a between 1 and 3 and b <= 1 order by a desc, b desc;
|
|
a b c
|
|
2 1 b
|
|
2 1 a
|
|
1 1 b
|
|
1 1 b
|
|
1 1
|
|
1 0 b
|
|
1 0
|
|
explain select * from t1 where a between 0 and 1 order by a desc, b desc;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 range a a 4 NULL 5 Using where; Using index
|
|
select * from t1 where a between 0 and 1 order by a desc, b desc;
|
|
a b c
|
|
1 3 b
|
|
1 1 b
|
|
1 1 b
|
|
1 1
|
|
1 0 b
|
|
1 0
|
|
drop table t1;
|
|
CREATE TABLE t1 (
|
|
gid int(10) unsigned NOT NULL auto_increment,
|
|
cid smallint(5) unsigned NOT NULL default '0',
|
|
PRIMARY KEY (gid),
|
|
KEY component_id (cid)
|
|
) ENGINE=MyISAM;
|
|
INSERT INTO t1 VALUES (103853,108),(103867,108),(103962,108),(104505,108),(104619,108),(104620,108);
|
|
ALTER TABLE t1 add skr int(10) not null;
|
|
CREATE TABLE t2 (
|
|
gid int(10) unsigned NOT NULL default '0',
|
|
uid smallint(5) unsigned NOT NULL default '1',
|
|
sid tinyint(3) unsigned NOT NULL default '1',
|
|
PRIMARY KEY (gid),
|
|
KEY uid (uid),
|
|
KEY status_id (sid)
|
|
) ENGINE=MyISAM;
|
|
INSERT INTO t2 VALUES (103853,250,5),(103867,27,5),(103962,27,5),(104505,117,5),(104619,75,5),(104620,15,5);
|
|
CREATE TABLE t3 (
|
|
uid smallint(6) NOT NULL auto_increment,
|
|
PRIMARY KEY (uid)
|
|
) ENGINE=MyISAM;
|
|
INSERT INTO t3 VALUES (1),(15),(27),(75),(117),(250);
|
|
ALTER TABLE t3 add skr int(10) not null;
|
|
select t1.gid, t2.sid, t3.uid from t2, t1, t3 where t2.gid = t1.gid and t2.uid = t3.uid order by t3.uid, t1.gid;
|
|
gid sid uid
|
|
104620 5 15
|
|
103867 5 27
|
|
103962 5 27
|
|
104619 5 75
|
|
104505 5 117
|
|
103853 5 250
|
|
select t1.gid, t2.sid, t3.uid from t3, t2, t1 where t2.gid = t1.gid and t2.uid = t3.uid order by t3.uid, t1.gid;
|
|
gid sid uid
|
|
104620 5 15
|
|
103867 5 27
|
|
103962 5 27
|
|
104619 5 75
|
|
104505 5 117
|
|
103853 5 250
|
|
EXPLAIN select t1.gid, t2.sid, t3.uid from t3, t2, t1 where t2.gid = t1.gid and t2.uid = t3.uid order by t1.gid, t3.uid;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 6 Using index
|
|
1 SIMPLE t2 eq_ref PRIMARY,uid PRIMARY 4 test.t1.gid 1
|
|
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 2 test.t2.uid 1 Using where; Using index
|
|
EXPLAIN SELECT t1.gid, t3.uid from t1, t3 where t1.gid = t3.uid order by t1.gid,t3.skr;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t3 ALL PRIMARY NULL NULL NULL 6 Using temporary; Using filesort
|
|
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t3.uid 1 Using where; Using index
|
|
EXPLAIN SELECT t1.gid, t2.sid, t3.uid from t2, t1, t3 where t2.gid = t1.gid and t2.uid = t3.uid order by t3.uid, t1.gid;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 6 Using index; Using temporary; Using filesort
|
|
1 SIMPLE t2 eq_ref PRIMARY,uid PRIMARY 4 test.t1.gid 1
|
|
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 2 test.t2.uid 1 Using where; Using index
|
|
EXPLAIN SELECT t1.gid, t3.uid from t1, t3 where t1.gid = t3.uid order by t3.skr,t1.gid;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t3 ALL PRIMARY NULL NULL NULL 6 Using temporary; Using filesort
|
|
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t3.uid 1 Using where; Using index
|
|
EXPLAIN SELECT t1.gid, t3.uid from t1, t3 where t1.skr = t3.uid order by t1.gid,t3.skr;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 6 Using temporary; Using filesort
|
|
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 2 test.t1.skr 1 Using where
|
|
drop table t1,t2,t3;
|
|
CREATE TABLE t1 (
|
|
`titre` char(80) NOT NULL default '',
|
|
`numeropost` mediumint(8) unsigned NOT NULL auto_increment,
|
|
`date` datetime NOT NULL default '0000-00-00 00:00:00',
|
|
`auteur` char(35) NOT NULL default '',
|
|
`icone` tinyint(2) unsigned NOT NULL default '0',
|
|
`lastauteur` char(35) NOT NULL default '',
|
|
`nbrep` smallint(6) unsigned NOT NULL default '0',
|
|
`dest` char(35) NOT NULL default '',
|
|
`lu` tinyint(1) unsigned NOT NULL default '0',
|
|
`vue` mediumint(8) unsigned NOT NULL default '0',
|
|
`ludest` tinyint(1) unsigned NOT NULL default '0',
|
|
`ouvert` tinyint(1) unsigned NOT NULL default '1',
|
|
PRIMARY KEY (`numeropost`),
|
|
KEY `date` (`date`),
|
|
KEY `dest` (`dest`,`ludest`),
|
|
KEY `auteur` (`auteur`,`lu`),
|
|
KEY `auteur_2` (`auteur`,`date`),
|
|
KEY `dest_2` (`dest`,`date`)
|
|
) CHECKSUM=1;
|
|
CREATE TABLE t2 (
|
|
`numeropost` mediumint(8) unsigned NOT NULL default '0',
|
|
`pseudo` char(35) NOT NULL default '',
|
|
PRIMARY KEY (`numeropost`,`pseudo`),
|
|
KEY `pseudo` (`pseudo`)
|
|
);
|
|
INSERT INTO t1 (titre,auteur,dest) VALUES ('test','joce','bug');
|
|
INSERT INTO t2 (numeropost,pseudo) VALUES (1,'joce'),(1,'bug');
|
|
SELECT titre,t1.numeropost,auteur,icone,nbrep,0,date,vue,ouvert,lastauteur,dest FROM t2 LEFT JOIN t1 USING(numeropost) WHERE t2.pseudo='joce' ORDER BY date DESC LIMIT 0,30;
|
|
titre numeropost auteur icone nbrep 0 date vue ouvert lastauteur dest
|
|
test 1 joce 0 0 0 0000-00-00 00:00:00 0 1 bug
|
|
SELECT titre,t1.numeropost,auteur,icone,nbrep,'0',date,vue,ouvert,lastauteur,dest FROM t2 LEFT JOIN t1 USING(numeropost) WHERE t2.pseudo='joce' ORDER BY date DESC LIMIT 0,30;
|
|
titre numeropost auteur icone nbrep 0 date vue ouvert lastauteur dest
|
|
test 1 joce 0 0 0 0000-00-00 00:00:00 0 1 bug
|
|
drop table t1,t2;
|
|
CREATE TABLE t1 (a int, b int);
|
|
INSERT INTO t1 VALUES (1, 2);
|
|
INSERT INTO t1 VALUES (3, 4);
|
|
INSERT INTO t1 VALUES (5, NULL);
|
|
SELECT * FROM t1 ORDER BY b;
|
|
a b
|
|
5 NULL
|
|
1 2
|
|
3 4
|
|
SELECT * FROM t1 ORDER BY b DESC;
|
|
a b
|
|
3 4
|
|
1 2
|
|
5 NULL
|
|
SELECT * FROM t1 ORDER BY (a + b);
|
|
a b
|
|
5 NULL
|
|
1 2
|
|
3 4
|
|
SELECT * FROM t1 ORDER BY (a + b) DESC;
|
|
a b
|
|
3 4
|
|
1 2
|
|
5 NULL
|
|
DROP TABLE t1;
|
|
create table t1(id int not null auto_increment primary key, t char(12));
|
|
explain select id,t from t1 order by id;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 1000 Using filesort
|
|
explain select id,t from t1 force index (primary) order by id;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 index NULL PRIMARY 4 NULL 1000
|
|
drop table t1;
|
|
CREATE TABLE t1 (
|
|
FieldKey varchar(36) NOT NULL default '',
|
|
LongVal bigint(20) default NULL,
|
|
StringVal mediumtext,
|
|
KEY FieldKey (FieldKey),
|
|
KEY LongField (FieldKey,LongVal),
|
|
KEY StringField (FieldKey,StringVal(32))
|
|
);
|
|
INSERT INTO t1 VALUES ('0',3,'0'),('0',2,'1'),('0',1,'2'),('1',2,'1'),('1',1,'3'), ('1',0,'2'),('2',3,'0'),('2',2,'1'),('2',1,'2'),('2',3,'0'),('2',2,'1'),('2',1,'2'),('3',2,'1'),('3',1,'2'),('3','3','3');
|
|
EXPLAIN SELECT * FROM t1 WHERE FieldKey = '1' ORDER BY LongVal;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ref FieldKey,LongField,StringField LongField 36 const 3 Using where
|
|
SELECT * FROM t1 WHERE FieldKey = '1' ORDER BY LongVal;
|
|
FieldKey LongVal StringVal
|
|
1 0 2
|
|
1 1 3
|
|
1 2 1
|
|
EXPLAIN SELECT * FROM t1 WHERE FieldKey > '2' ORDER BY LongVal;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 range FieldKey,LongField,StringField FieldKey 36 NULL 4 Using where; Using filesort
|
|
SELECT * FROM t1 WHERE FieldKey > '2' ORDER BY LongVal;
|
|
FieldKey LongVal StringVal
|
|
3 1 2
|
|
3 2 1
|
|
3 3 3
|
|
EXPLAIN SELECT * FROM t1 WHERE FieldKey > '2' ORDER BY FieldKey, LongVal;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 range FieldKey,LongField,StringField LongField 36 NULL 4 Using where
|
|
SELECT * FROM t1 WHERE FieldKey > '2' ORDER BY FieldKey, LongVal;
|
|
FieldKey LongVal StringVal
|
|
3 1 2
|
|
3 2 1
|
|
3 3 3
|
|
DROP TABLE t1;
|
|
CREATE TABLE t1 (a INT, b INT);
|
|
SET @id=0;
|
|
UPDATE t1 SET a=0 ORDER BY (a=@id), b;
|
|
DROP TABLE t1;
|
|
CREATE TABLE t1 ( id smallint(6) unsigned NOT NULL default '0', menu tinyint(4) NOT NULL default '0', KEY id (id), KEY menu (menu)) ENGINE=MyISAM;
|
|
INSERT INTO t1 VALUES (11384, 2),(11392, 2);
|
|
SELECT id FROM t1 WHERE id <11984 AND menu =2 ORDER BY id DESC LIMIT 1 ;
|
|
id
|
|
11392
|
|
drop table t1;
|
|
create table t1(a int, b int, index(b));
|
|
insert into t1 values (2, 1), (1, 1), (4, NULL), (3, NULL), (6, 2), (5, 2);
|
|
explain select * from t1 where b=1 or b is null order by a;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ref_or_null b b 5 const 3 Using where; Using filesort
|
|
select * from t1 where b=1 or b is null order by a;
|
|
a b
|
|
1 1
|
|
2 1
|
|
3 NULL
|
|
4 NULL
|
|
explain select * from t1 where b=2 or b is null order by a;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ref_or_null b b 5 const 4 Using where; Using filesort
|
|
select * from t1 where b=2 or b is null order by a;
|
|
a b
|
|
3 NULL
|
|
4 NULL
|
|
5 2
|
|
6 2
|
|
drop table t1;
|
|
create table t1 (a int not null auto_increment, b int not null, c int not null, d int not null,
|
|
key(a,b,d), key(c,b,a));
|
|
create table t2 like t1;
|
|
insert into t1 values (NULL, 1, 2, 0), (NULL, 2, 1, 1), (NULL, 3, 4, 2), (NULL, 4, 3, 3);
|
|
insert into t2 select null, b, c, d from t1;
|
|
insert into t1 select null, b, c, d from t2;
|
|
insert into t2 select null, b, c, d from t1;
|
|
insert into t1 select null, b, c, d from t2;
|
|
insert into t2 select null, b, c, d from t1;
|
|
insert into t1 select null, b, c, d from t2;
|
|
insert into t2 select null, b, c, d from t1;
|
|
insert into t1 select null, b, c, d from t2;
|
|
insert into t2 select null, b, c, d from t1;
|
|
insert into t1 select null, b, c, d from t2;
|
|
optimize table t1;
|
|
Table Op Msg_type Msg_text
|
|
test.t1 optimize status OK
|
|
set @row=10;
|
|
insert into t1 select 1, b, c + (@row:=@row - 1) * 10, d - @row from t2 limit 10;
|
|
select * from t1 where a=1 and b in (1) order by c, b, a;
|
|
a b c d
|
|
1 1 2 0
|
|
1 1 12 -1
|
|
1 1 52 -5
|
|
1 1 92 -9
|
|
select * from t1 where a=1 and b in (1);
|
|
a b c d
|
|
1 1 92 -9
|
|
1 1 52 -5
|
|
1 1 12 -1
|
|
1 1 2 0
|
|
drop table t1, t2;
|
|
create table t1 (col1 int, col int);
|
|
create table t2 (col2 int, col int);
|
|
insert into t1 values (1,1),(2,2),(3,3);
|
|
insert into t2 values (1,3),(2,2),(3,1);
|
|
select t1.* , t2.col as t2_col from t1 left join t2 on (t1.col1=t2.col2)
|
|
order by col;
|
|
col1 col t2_col
|
|
1 1 3
|
|
2 2 2
|
|
3 3 1
|
|
select col1 as col, col from t1 order by col;
|
|
ERROR 23000: Column 'col' in order clause is ambiguous
|
|
select t1.col as c1, t2.col as c2 from t1, t2 where t1.col1=t2.col2
|
|
order by col;
|
|
ERROR 23000: Column 'col' in order clause is ambiguous
|
|
select t1.col as c1, t2.col as c2 from t1, t2 where t1.col1=t2.col2
|
|
order by col;
|
|
ERROR 23000: Column 'col' in order clause is ambiguous
|
|
select col1 from t1, t2 where t1.col1=t2.col2 order by col;
|
|
ERROR 23000: Column 'col' in order clause is ambiguous
|
|
select t1.col as t1_col, t2.col from t1, t2 where t1.col1=t2.col2
|
|
order by col;
|
|
t1_col col
|
|
3 1
|
|
2 2
|
|
1 3
|
|
select col2 as c, col as c from t2 order by col;
|
|
c c
|
|
3 1
|
|
2 2
|
|
1 3
|
|
select col2 as col, col as col2 from t2 order by col;
|
|
col col2
|
|
1 3
|
|
2 2
|
|
3 1
|
|
select t1.col as t1_col, t2.col2 from t1, t2 where t1.col1=t2.col2
|
|
order by col;
|
|
t1_col col2
|
|
1 1
|
|
2 2
|
|
3 3
|
|
select t2.col2, t2.col, t2.col from t2 order by col;
|
|
col2 col col
|
|
3 1 1
|
|
2 2 2
|
|
1 3 3
|
|
select t2.col2 as col from t2 order by t2.col;
|
|
col
|
|
3
|
|
2
|
|
1
|
|
select t2.col2 as col, t2.col from t2 order by t2.col;
|
|
col col
|
|
3 1
|
|
2 2
|
|
1 3
|
|
select t2.col2, t2.col, t2.col from t2 order by t2.col;
|
|
col2 col col
|
|
3 1 1
|
|
2 2 2
|
|
1 3 3
|
|
drop table t1, t2;
|