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drop table if exists t1;
drop table if exists t2;
SET SQL_WARNINGS=1;
create TEMPORARY 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;
show table status like "t1";
Session Schema Name Type Engine Version Rows Avg_row_length Table_size Auto_increment
# test t1 TEMPORARY MyISAM # # # # #
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 int 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 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 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 temporary table t1 (a int not null auto_increment primary key) /*!40102 engine=MEMORY */;
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 int 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;
select last_insert_id();
last_insert_id()
256
drop table t1;
create table t1 (i int 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 'b'
select last_insert_id();
last_insert_id()
2
drop table t1;
create table t1(a int auto_increment,b int null,primary key(a));
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 int;
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;
ERROR 23000: Column 'a' cannot be null
update t1 set a=300 where b=7;
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
203 6
300 7
205 8
400 9
0 10
401 11
402 12
403 13
404 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
203 6
300 7
205 8
400 9
401 11
0 12
403 13
404 14
delete from t1 where a=0;
update t1 set a=NULL where b=13;
ERROR 23000: Column 'a' cannot be null
update t1 set a=500 where b=14;
select * from t1 order by b;
a b
1 1
200 2
201 4
203 6
300 7
205 8
400 9
401 11
403 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;
ERROR 23000: ALTER TABLE causes auto_increment resequencing, resulting in duplicate entry '0' for key 'PRIMARY'
select * from t1;
a
1
2
3
0
0
drop table t1;
create table t1 (a bigint);
insert into t1 values (0), (1), (2), (3);
alter table t1 modify a bigint not null auto_increment primary key;
select * from t1;
a
0
1
2
3
drop table t1;
create table t1 (a int auto_increment primary key , b int null);
insert into t1 values (0,1),(1,2),(2,3);
select * from t1;
a b
0 1
1 2
2 3
alter table t1 modify b varchar(255);
insert into t1 values (0,4);
ERROR 23000: Duplicate entry '0' for key 'PRIMARY'
select * from t1;
a b
0 1
1 2
2 3
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;
CREATE TABLE t1 (
t1_name VARCHAR(255) DEFAULT NULL,
t1_id INT not null AUTO_INCREMENT,
KEY (t1_name),
PRIMARY KEY (t1_id)
) AUTO_INCREMENT = 1000;
Warnings:
Warning 1071 Specified key was too long; max key length is 767 bytes
INSERT INTO t1 (t1_name) VALUES('MySQL');
INSERT INTO t1 (t1_name) VALUES('MySQL');
INSERT INTO t1 (t1_name) VALUES('MySQL');
SELECT * from t1;
t1_name t1_id
MySQL 1000
MySQL 1001
MySQL 1002
SHOW CREATE TABLE `t1`;
Table Create Table
t1 CREATE TABLE `t1` (
`t1_name` varchar(255) DEFAULT NULL,
`t1_id` int NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`t1_id`),
KEY `t1_name` (`t1_name`(191))
) ENGINE=InnoDB
DROP TABLE `t1`;
create table t1(a int not null auto_increment primary key);
create table t2(a int not null auto_increment primary key, t1a int);
insert into t1 values(NULL);
insert into t2 values (NULL, LAST_INSERT_ID()), (NULL, LAST_INSERT_ID());
insert into t1 values (NULL);
insert into t2 values (NULL, LAST_INSERT_ID()), (NULL, LAST_INSERT_ID()),
(NULL, LAST_INSERT_ID());
insert into t1 values (NULL);
insert into t2 values (NULL, LAST_INSERT_ID()), (NULL, LAST_INSERT_ID()),
(NULL, LAST_INSERT_ID()), (NULL, LAST_INSERT_ID());
select * from t2;
a t1a
1 1
2 1
3 2
4 2
5 2
6 3
7 3
8 3
9 3
drop table t1, t2;
End of 4.1 tests
CREATE TABLE t1 ( `a` int NOT NULL auto_increment, `b` int default NULL,PRIMARY KEY (`a`),UNIQUE KEY `b` (`b`));
insert into t1 (b) values (1);
replace into t1 (b) values (2), (1), (3);
select * from t1;
a b
2 2
3 1
4 3
truncate table t1;
insert into t1 (b) values (1);
replace into t1 (b) values (2);
replace into t1 (b) values (1);
replace into t1 (b) values (3);
select * from t1;
a b
2 2
3 1
4 3
drop table t1;
create table t1 (rowid int not null auto_increment, val int not null,primary
key (rowid), unique(val));
replace into t1 (val) values ('1'),('2');
replace into t1 (val) values ('1'),('2');
insert into t1 (val) values ('1'),('2');
ERROR 23000: Duplicate entry '1' for key 'val'
select * from t1;
rowid val
3 1
4 2
drop table t1;
CREATE TABLE t1 (t1 INT PRIMARY KEY, t2 INT);
INSERT INTO t1 VALUES(0, 0);
INSERT INTO t1 VALUES(1, 1);
ALTER TABLE t1 CHANGE t1 t1 INT auto_increment;
INSERT INTO t1 VALUES(0,0);
ERROR 23000: Duplicate entry '0' for key 'PRIMARY'
DROP TABLE t1;
create table t1 (a int primary key auto_increment, b int, c int, d timestamp default current_timestamp, unique(b),unique(c));
insert into t1 values(null,1,1,now());
insert into t1 values(null,0,0,null);
replace into t1 values(null,1,0,null);
select last_insert_id();
last_insert_id()
3
drop table t1;
|