auto_increment.result
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:7k
源码类别:
MySQL数据库
开发平台:
Visual C++
- drop table if exists t1;
- drop table if exists t2;
- SET SQL_WARNINGS=1;
- create table t1 (a int not null auto_increment,b int, primary key (a)) engine=myisam 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)
- );
- 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;
- create table t1 (a char(10) not null, b int not null auto_increment, primary key(a,b));
- insert into t1 values ("a",1),("b",2),("a",2),("c",1);
- insert into t1 values ("a",NULL),("b",NULL),("c",NULL),("e",NULL);
- insert into t1 (a) values ("a"),("b"),("c"),("d");
- insert into t1 (a) values ('k'),('d');
- insert into t1 (a) values ("a");
- insert into t1 values ("d",last_insert_id());
- select * from t1;
- a b
- a 1
- a 2
- a 3
- a 4
- a 5
- b 2
- b 3
- b 4
- c 1
- c 2
- c 3
- d 1
- d 2
- d 5
- e 1
- k 1
- drop table t1;
- create table t1 (ordid int(8) not null auto_increment, ord varchar(50) not null, primary key (ordid), index(ord,ordid));
- insert into t1 (ordid,ord) values (NULL,'sdj'),(NULL,'sdj');
- select * from t1;
- ordid ord
- 1 sdj
- 2 sdj
- drop table t1;
- create table t1 (ordid int(8) not null auto_increment, ord varchar(50) not null, primary key (ord,ordid));
- insert into t1 values (NULL,'sdj'),(NULL,'sdj'),(NULL,"abc"),(NULL,'abc'),(NULL,'zzz'),(NULL,'sdj'),(NULL,'abc');
- select * from t1;
- ordid ord
- 1 abc
- 2 abc
- 3 abc
- 1 sdj
- 2 sdj
- 3 sdj
- 1 zzz
- drop table t1;
- create table t1 (sid char(5), id int(2) NOT NULL auto_increment, key(sid, id));
- create table t2 (sid char(20), id int(2));
- insert into t2 values ('skr',NULL),('skr',NULL),('test',NULL);
- insert into t1 select * from t2;
- select * from t1;
- sid id
- skr 1
- skr 2
- test 1
- drop table t1,t2;
- create table t1 (a int not null primary key auto_increment);
- insert into t1 values (0);
- update t1 set a=0;
- select * from t1;
- a
- 0
- check table t1;
- Table Op Msg_type Msg_text
- test.t1 check warning Found row where the auto_increment column has the value 0
- test.t1 check status OK
- drop table t1;
- create table t1 (a int not null auto_increment primary key);
- insert into t1 values (NULL);
- insert into t1 values (-1);
- select last_insert_id();
- last_insert_id()
- 1
- insert into t1 values (NULL);
- select * from t1;
- a
- -1
- 1
- 2
- drop table t1;
- create table t1 (a int not null auto_increment primary key) /*!40102 engine=heap */;
- insert into t1 values (NULL);
- insert into t1 values (-1);
- select last_insert_id();
- last_insert_id()
- 1
- insert into t1 values (NULL);
- select * from t1;
- a
- 1
- -1
- 2
- drop table t1;
- create table t1 (i tinyint unsigned not null auto_increment primary key);
- insert into t1 set i = 254;
- insert into t1 set i = null;
- select last_insert_id();
- last_insert_id()
- 255
- explain extended select last_insert_id();
- id select_type table type possible_keys key key_len ref rows Extra
- 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
- Warnings:
- Note 1003 select sql_no_cache last_insert_id() AS `last_insert_id()`
- insert into t1 set i = 254;
- ERROR 23000: Duplicate entry '254' for key 1
- select last_insert_id();
- last_insert_id()
- 255
- insert into t1 set i = null;
- ERROR 23000: Duplicate entry '255' for key 1
- select last_insert_id();
- last_insert_id()
- 0
- drop table t1;
- create table t1 (i tinyint unsigned not null auto_increment, key (i));
- insert into t1 set i = 254;
- insert into t1 set i = null;
- select last_insert_id();
- last_insert_id()
- 255
- insert into t1 set i = null;
- Warnings:
- Warning 1264 Data truncated; out of range for column 'i' at row 1
- select last_insert_id();
- last_insert_id()
- 255
- drop table t1;
- create table t1 (i tinyint unsigned not null auto_increment primary key, b int, unique (b));
- insert into t1 values (NULL, 10);
- select last_insert_id();
- last_insert_id()
- 1
- insert into t1 values (NULL, 15);
- select last_insert_id();
- last_insert_id()
- 2
- insert into t1 values (NULL, 10);
- ERROR 23000: Duplicate entry '10' for key 2
- select last_insert_id();
- last_insert_id()
- 0
- drop table t1;
- create table t1(a int auto_increment,b int null,primary key(a));
- SET SQL_MODE=NO_AUTO_VALUE_ON_ZERO;
- insert into t1(a,b)values(NULL,1);
- insert into t1(a,b)values(200,2);
- insert into t1(a,b)values(0,3);
- insert into t1(b)values(4);
- insert into t1(b)values(5);
- insert into t1(b)values(6);
- insert into t1(b)values(7);
- select * from t1 order by b;
- a b
- 1 1
- 200 2
- 0 3
- 201 4
- 202 5
- 203 6
- 204 7
- alter table t1 modify b mediumint;
- select * from t1 order by b;
- a b
- 1 1
- 200 2
- 0 3
- 201 4
- 202 5
- 203 6
- 204 7
- create table t2 (a int);
- insert t2 values (1),(2);
- alter table t2 add b int auto_increment primary key;
- select * from t2;
- a b
- 1 1
- 2 2
- drop table t2;
- delete from t1 where a=0;
- update t1 set a=0 where b=5;
- select * from t1 order by b;
- a b
- 1 1
- 200 2
- 201 4
- 0 5
- 203 6
- 204 7
- delete from t1 where a=0;
- update t1 set a=NULL where b=6;
- Warnings:
- Warning 1263 Data truncated; NULL supplied to NOT NULL column 'a' at row 4
- update t1 set a=300 where b=7;
- SET SQL_MODE='';
- insert into t1(a,b)values(NULL,8);
- insert into t1(a,b)values(400,9);
- insert into t1(a,b)values(0,10);
- insert into t1(b)values(11);
- insert into t1(b)values(12);
- insert into t1(b)values(13);
- insert into t1(b)values(14);
- select * from t1 order by b;
- a b
- 1 1
- 200 2
- 201 4
- 0 6
- 300 7
- 301 8
- 400 9
- 401 10
- 402 11
- 403 12
- 404 13
- 405 14
- delete from t1 where a=0;
- update t1 set a=0 where b=12;
- select * from t1 order by b;
- a b
- 1 1
- 200 2
- 201 4
- 300 7
- 301 8
- 400 9
- 401 10
- 402 11
- 0 12
- 404 13
- 405 14
- delete from t1 where a=0;
- update t1 set a=NULL where b=13;
- Warnings:
- Warning 1263 Data truncated; NULL supplied to NOT NULL column 'a' at row 9
- update t1 set a=500 where b=14;
- select * from t1 order by b;
- a b
- 1 1
- 200 2
- 201 4
- 300 7
- 301 8
- 400 9
- 401 10
- 402 11
- 0 13
- 500 14
- drop table t1;
- create table t1 (a bigint);
- insert into t1 values (1), (2), (3), (NULL), (NULL);
- alter table t1 modify a bigint not null auto_increment primary key;
- select * from t1;
- a
- 1
- 2
- 3
- 4
- 5
- drop table t1;
- create table t1 (a bigint);
- insert into t1 values (1), (2), (3), (0), (0);
- alter table t1 modify a bigint not null auto_increment primary key;
- select * from t1;
- a
- 1
- 2
- 3
- 4
- 5
- drop table t1;
- create table t1 (a bigint);
- insert into t1 values (0), (1), (2), (3);
- set sql_mode=NO_AUTO_VALUE_ON_ZERO;
- alter table t1 modify a bigint not null auto_increment primary key;
- set sql_mode= '';
- select * from t1;
- a
- 0
- 1
- 2
- 3
- drop table t1;
- create table t1 (a int auto_increment primary key , b int null);
- set sql_mode=NO_AUTO_VALUE_ON_ZERO;
- insert into t1 values (0,1),(1,2),(2,3);
- select * from t1;
- a b
- 0 1
- 1 2
- 2 3
- set sql_mode= '';
- alter table t1 modify b varchar(255);
- insert into t1 values (0,4);
- select * from t1;
- a b
- 0 1
- 1 2
- 2 3
- 3 4
- drop table t1;
- CREATE TABLE t1 ( a INT AUTO_INCREMENT, b BLOB, PRIMARY KEY (a,b(10)));
- INSERT INTO t1 (b) VALUES ('aaaa');
- CHECK TABLE t1;
- Table Op Msg_type Msg_text
- test.t1 check status OK
- INSERT INTO t1 (b) VALUES ('');
- CHECK TABLE t1;
- Table Op Msg_type Msg_text
- test.t1 check status OK
- INSERT INTO t1 (b) VALUES ('bbbb');
- CHECK TABLE t1;
- Table Op Msg_type Msg_text
- test.t1 check status OK
- DROP TABLE IF EXISTS t1;