heap_auto_increment.result
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:1k
源码类别:
MySQL数据库
开发平台:
Visual C++
- drop table if exists t1;
- create table t1 (a int not null auto_increment,b int, primary key (a)) engine=heap auto_increment=3;
- insert into t1 values (1,1),(NULL,3),(NULL,4);
- delete from t1 where a=4;
- insert into t1 values (NULL,5),(NULL,6);
- select * from t1;
- a b
- 1 1
- 3 3
- 5 5
- 6 6
- delete from t1 where a=6;
- replace t1 values (3,1);
- ALTER TABLE t1 add c int;
- replace t1 values (3,3,3);
- insert into t1 values (NULL,7,7);
- update t1 set a=8,b=b+1,c=c+1 where a=7;
- insert into t1 values (NULL,9,9);
- select * from t1;
- a b c
- 1 1 NULL
- 3 3 3
- 5 5 NULL
- 8 8 8
- 9 9 9
- drop table t1;
- create table t1 (
- skey tinyint unsigned NOT NULL auto_increment PRIMARY KEY,
- sval char(20)
- ) engine=heap;
- insert into t1 values (NULL, "hello");
- insert into t1 values (NULL, "hey");
- select * from t1;
- skey sval
- 1 hello
- 2 hey
- select _rowid,t1._rowid,skey,sval from t1;
- _rowid _rowid skey sval
- 1 1 1 hello
- 2 2 2 hey
- drop table t1;