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137 lines
3.6 KiB
Text
137 lines
3.6 KiB
Text
drop table if exists t1,t2,t3;
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create table t1(id1 int not null auto_increment primary key, t char(12));
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create table t2(id2 int not null, t char(12));
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create table t3(id3 int not null, t char(12), index(id3));
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select count(*) from t1 where id1 > 95;
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count(*)
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5
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select count(*) from t2 where id2 > 95;
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count(*)
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25
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select count(*) from t3 where id3 > 95;
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count(*)
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250
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update t1,t2,t3 set t1.t="aaa", t2.t="bbb", t3.t="cc" where t1.id1 = t2.id2 and t2.id2 = t3.id3 and t1.id1 > 90;
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select count(*) from t1 where t = "aaa";
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count(*)
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10
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select count(*) from t1 where id1 > 90;
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count(*)
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10
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select count(*) from t2 where t = "bbb";
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count(*)
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10
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select count(*) from t2 where id2 > 90;
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count(*)
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50
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select count(*) from t3 where t = "cc";
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count(*)
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500
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select count(*) from t3 where id3 > 90;
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count(*)
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500
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delete t1.*, t2.*, t3.* from t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3 and t1.id1 > 95;
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check table t1, t2, t3;
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Table Op Msg_type Msg_text
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test.t1 check status OK
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test.t2 check status OK
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test.t3 check status OK
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select count(*) from t1 where id1 > 95;
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count(*)
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0
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select count(*) from t2 where id2 > 95;
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count(*)
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0
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select count(*) from t3 where id3 > 95;
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count(*)
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0
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delete t1, t2, t3 from t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3 and t1.id1 > 5;
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select count(*) from t1 where id1 > 5;
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count(*)
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0
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select count(*) from t2 where id2 > 5;
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count(*)
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0
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select count(*) from t3 where id3 > 5;
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count(*)
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0
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delete from t1, t2, t3 using t1,t2,t3 where t1.id1 = t2.id2 and t2.id2 = t3.id3 and t1.id1 > 0;
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select count(*) from t1 where id1;
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count(*)
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0
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select count(*) from t2 where id2;
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count(*)
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0
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select count(*) from t3 where id3;
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count(*)
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0
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drop table t1,t2,t3;
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create table t1(id1 int not null primary key, t varchar(100)) pack_keys = 1;
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create table t2(id2 int not null, t varchar(100), index(id2)) pack_keys = 1;
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delete t1 from t1,t2 where t1.id1 = t2.id2 and t1.id1 > 500;
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drop table t1,t2;
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DROP TABLE IF EXISTS a,b,c;
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CREATE TABLE a (
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id int(11) NOT NULL default '0',
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name varchar(10) default NULL,
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PRIMARY KEY (id)
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) TYPE=MyISAM;
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INSERT INTO a VALUES (1,'aaa'),(2,'aaa'),(3,'aaa');
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CREATE TABLE b (
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id int(11) NOT NULL default '0',
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name varchar(10) default NULL,
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PRIMARY KEY (id)
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) TYPE=MyISAM;
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INSERT INTO b VALUES (2,'bbb'),(3,'bbb'),(4,'bbb');
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CREATE TABLE c (
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id int(11) NOT NULL default '0',
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mydate datetime default NULL,
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PRIMARY KEY (id)
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) TYPE=MyISAM;
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INSERT INTO c VALUES (1,'2002-02-04 00:00:00'),(3,'2002-05-12 00:00:00'),(5,'2002-05-12 00:00:00'),(6,'2002-06-22
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00:00:00'),(7,'2002-07-22 00:00:00');
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delete a,b,c from a,b,c
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where to_days(now())-to_days(c.mydate)>=30
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and c.id=a.id and c.id=b.id;
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select * from c;
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id mydate
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1 2002-02-04 00:00:00
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5 2002-05-12 00:00:00
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6 2002-06-22 00:00:00
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7 2002-07-22 00:00:00
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DROP TABLE IF EXISTS a,b,c;
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drop table if exists parent, child;
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CREATE TABLE IF NOT EXISTS `parent` (
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`id` int(11) NOT NULL auto_increment,
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`tst` text,
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`tst1` text,
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PRIMARY KEY (`id`)
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) TYPE=MyISAM;
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CREATE TABLE IF NOT EXISTS `child` (
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`ID` int(11) NOT NULL auto_increment,
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`ParId` int(11) default NULL,
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`tst` text,
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`tst1` text,
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PRIMARY KEY (`ID`),
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KEY `IX_ParId_child` (`ParId`),
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FOREIGN KEY (`ParId`) REFERENCES `test.parent` (`id`)
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) TYPE=MyISAM;
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INSERT INTO parent(tst,tst1)
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VALUES("MySQL","MySQL AB"), ("MSSQL","Microsoft"), ("ORACLE","ORACLE");
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INSERT INTO child(ParId)
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VALUES(1), (2), (3);
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select * from child;
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ID ParId tst tst1
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1 1 NULL NULL
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2 2 NULL NULL
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3 3 NULL NULL
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UPDATE child, parent
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SET child.tst = parent.tst,
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child.tst1 = parent.tst1
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WHERE child.ParId = parent.Id;
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select * from child;
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ID ParId tst tst1
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1 1 MySQL MySQL AB
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2 2 MSSQL Microsoft
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3 3 ORACLE ORACLE
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drop table parent, child;
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