delete.result
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:4k
- drop table if exists t1,t11,t12,t2;
- CREATE TABLE t1 (a tinyint(3), b tinyint(5));
- INSERT INTO t1 VALUES (1,1);
- INSERT LOW_PRIORITY INTO t1 VALUES (1,2);
- INSERT INTO t1 VALUES (1,3);
- DELETE from t1 where a=1 limit 1;
- DELETE LOW_PRIORITY from t1 where a=1;
- INSERT INTO t1 VALUES (1,1);
- DELETE from t1;
- LOCK TABLE t1 write;
- INSERT INTO t1 VALUES (1,2);
- DELETE from t1;
- UNLOCK TABLES;
- INSERT INTO t1 VALUES (1,2);
- SET AUTOCOMMIT=0;
- DELETE from t1;
- SET AUTOCOMMIT=1;
- drop table t1;
- create table t1 (
- a bigint not null,
- b bigint not null default 0,
- c bigint not null default 0,
- d bigint not null default 0,
- e bigint not null default 0,
- f bigint not null default 0,
- g bigint not null default 0,
- h bigint not null default 0,
- i bigint not null default 0,
- j bigint not null default 0,
- primary key (a,b,c,d,e,f,g,h,i,j));
- insert into t1 (a) values (2),(4),(6),(8),(10),(12),(14),(16),(18),(20),(22),(24),(26),(23);
- delete from t1 where a=26;
- drop table t1;
- create table t1 (
- a bigint not null,
- b bigint not null default 0,
- c bigint not null default 0,
- d bigint not null default 0,
- e bigint not null default 0,
- f bigint not null default 0,
- g bigint not null default 0,
- h bigint not null default 0,
- i bigint not null default 0,
- j bigint not null default 0,
- primary key (a,b,c,d,e,f,g,h,i,j));
- insert into t1 (a) values (2),(4),(6),(8),(10),(12),(14),(16),(18),(20),(22),(24),(26),(23),(27);
- delete from t1 where a=27;
- drop table t1;
- CREATE TABLE `t1` (
- `i` int(10) NOT NULL default '0',
- `i2` int(10) NOT NULL default '0',
- PRIMARY KEY (`i`)
- );
- DELETE FROM t1 USING t1 WHERE post='1';
- ERROR 42S22: Unknown column 'post' in 'where clause'
- drop table t1;
- CREATE TABLE t1 (
- bool char(0) default NULL,
- not_null varchar(20) binary NOT NULL default '',
- misc integer not null,
- PRIMARY KEY (not_null)
- ) ENGINE=MyISAM;
- INSERT INTO t1 VALUES (NULL,'a',4), (NULL,'b',5), (NULL,'c',6), (NULL,'d',7);
- select * from t1 where misc > 5 and bool is null;
- bool not_null misc
- NULL c 6
- NULL d 7
- delete from t1 where misc > 5 and bool is null;
- select * from t1 where misc > 5 and bool is null;
- bool not_null misc
- select count(*) from t1;
- count(*)
- 2
- delete from t1 where 1 > 2;
- select count(*) from t1;
- count(*)
- 2
- delete from t1 where 3 > 2;
- select count(*) from t1;
- count(*)
- 0
- drop table t1;
- create table t1 (a int not null auto_increment primary key, b char(32));
- insert into t1 (b) values ('apple'), ('apple');
- select * from t1;
- a b
- 1 apple
- 2 apple
- delete t1 from t1, t1 as t2 where t1.b = t2.b and t1.a > t2.a;
- select * from t1;
- a b
- 1 apple
- drop table t1;
- create table t11 (a int NOT NULL, b int, primary key (a));
- create table t12 (a int NOT NULL, b int, primary key (a));
- create table t2 (a int NOT NULL, b int, primary key (a));
- insert into t11 values (0, 10),(1, 11),(2, 12);
- insert into t12 values (33, 10),(0, 11),(2, 12);
- insert into t2 values (1, 21),(2, 12),(3, 23);
- select * from t11;
- a b
- 0 10
- 1 11
- 2 12
- select * from t12;
- a b
- 33 10
- 0 11
- 2 12
- select * from t2;
- a b
- 1 21
- 2 12
- 3 23
- delete t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b <> (select b from t2 where t11.a < t2.a);
- ERROR 21000: Subquery returns more than 1 row
- select * from t11;
- a b
- 0 10
- 1 11
- 2 12
- select * from t12;
- a b
- 33 10
- 0 11
- 2 12
- delete ignore t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b <> (select b from t2 where t11.a < t2.a);
- Warnings:
- Error 1242 Subquery returns more than 1 row
- Error 1242 Subquery returns more than 1 row
- select * from t11;
- a b
- 0 10
- 1 11
- select * from t12;
- a b
- 33 10
- 0 11
- insert into t11 values (2, 12);
- delete from t11 where t11.b <> (select b from t2 where t11.a < t2.a);
- ERROR 21000: Subquery returns more than 1 row
- select * from t11;
- a b
- 0 10
- 1 11
- 2 12
- delete ignore from t11 where t11.b <> (select b from t2 where t11.a < t2.a);
- Warnings:
- Error 1242 Subquery returns more than 1 row
- Error 1242 Subquery returns more than 1 row
- select * from t11;
- a b
- 0 10
- 1 11
- drop table t11, t12, t2;
- create table t1 (a int, b int, unique key (a), key (b));
- insert into t1 values (3, 3), (7, 7);
- delete t1 from t1 where a = 3;
- check table t1;
- Table Op Msg_type Msg_text
- test.t1 check status OK
- select * from t1;
- a b
- 7 7
- drop table t1;
- CREATE TABLE t1 ( a int PRIMARY KEY );
- DELETE FROM t1 WHERE t1.a > 0 ORDER BY t1.a;
- INSERT INTO t1 VALUES (0),(1),(2);
- DELETE FROM t1 WHERE t1.a > 0 ORDER BY t1.a LIMIT 1;
- SELECT * FROM t1;
- a
- 0
- 2
- DROP TABLE t1;