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79 lines
1.3 KiB
Plaintext
79 lines
1.3 KiB
Plaintext
drop table if exists t1;
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create table t1 (a int not null default 0 primary key, b int not null default 0);
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insert into t1 () values ();
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insert into t1 values (1,1),(2,1),(3,1);
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update t1 set a=4 where b=1 limit 1;
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select * from t1;
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a b
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0 0
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4 1
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2 1
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3 1
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update t1 set b=2 where b=1 limit 2;
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select * from t1;
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a b
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0 0
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4 2
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2 2
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3 1
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update t1 set b=4 where b=1;
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select * from t1;
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a b
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0 0
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4 2
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2 2
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3 4
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delete from t1 where b=2 limit 1;
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select * from t1;
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a b
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0 0
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2 2
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3 4
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delete from t1 limit 1;
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select * from t1;
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a b
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2 2
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3 4
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drop table t1;
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create table t1 (i int);
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insert into t1 (i) values(1),(1),(1);
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delete from t1 limit 1;
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update t1 set i=2 limit 1;
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delete from t1 limit 0;
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update t1 set i=3 limit 0;
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select * from t1;
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i
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2
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1
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drop table t1;
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select 0 limit 0;
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0
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CREATE TABLE t1(id int auto_increment primary key, id2 int, index(id2));
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INSERT INTO t1 (id2) values (0),(0),(0);
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DELETE FROM t1 WHERE id=1;
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INSERT INTO t1 SET id2=0;
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SELECT * FROM t1;
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id id2
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4 0
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2 0
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3 0
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DELETE FROM t1 WHERE id2 = 0 ORDER BY id LIMIT 1;
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SELECT * FROM t1;
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id id2
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4 0
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3 0
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DELETE FROM t1 WHERE id2 = 0 ORDER BY id desc LIMIT 1;
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SELECT * FROM t1;
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id id2
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3 0
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DROP TABLE t1;
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create table t1 (a integer);
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insert into t1 values (1);
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select 1 as a from t1 union all select 1 from dual limit 1;
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a
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1
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(select 1 as a from t1) union all (select 1 from dual) limit 1;
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a
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1
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drop table t1;
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