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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 Out of range value adjusted 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 Column set to default value; 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 Column set to default value; 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;
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