drop table if exists t1,t2;
set time_zone="+03:00";
CREATE TABLE t1 (a int, t timestamp);
CREATE TABLE t2 (a int, t datetime);
SET TIMESTAMP=1234;
insert into t1 values(1,NULL);
insert into t1 values(2,"2002-03-03");
SET TIMESTAMP=1235;
insert into t1 values(3,NULL);
SET TIMESTAMP=1236;
insert into t1 (a) values(4);
insert into t2 values(5,"2002-03-04"),(6,NULL),(7,"2002-03-05"),(8,"00-00-00");
SET TIMESTAMP=1237;
insert into t1 select * from t2;
SET TIMESTAMP=1238;
insert into t1 (a) select a+1 from t2 where a=8;
select * from t1;
a	t
1	1970-01-01 03:20:34
2	2002-03-03 00:00:00
3	1970-01-01 03:20:35
4	1970-01-01 03:20:36
5	2002-03-04 00:00:00
6	1970-01-01 03:20:37
7	2002-03-05 00:00:00
8	0000-00-00 00:00:00
9	1970-01-01 03:20:38
drop table t1,t2;
SET TIMESTAMP=1234;
CREATE TABLE t1 (value TEXT NOT NULL, id VARCHAR(32) NOT NULL, stamp timestamp, PRIMARY KEY (id));
INSERT INTO t1 VALUES ("my value", "myKey","1999-04-02 00:00:00");
SELECT stamp FROM t1 WHERE id="myKey";
stamp
1999-04-02 00:00:00
UPDATE t1 SET value="my value" WHERE id="myKey";
SELECT stamp FROM t1 WHERE id="myKey";
stamp
1999-04-02 00:00:00
UPDATE t1 SET id="myKey" WHERE value="my value";
SELECT stamp FROM t1 WHERE id="myKey";
stamp
1999-04-02 00:00:00
drop table t1;
create table t1 (a timestamp);
insert into t1 values (now());
select date_format(a,"%Y %y"),year(a),year(now()) from t1;
date_format(a,"%Y %y")	year(a)	year(now())
1970 70	1970	1970
drop table t1;
create table t1 (ix timestamp);
insert into t1 values (19991101000000),(19990102030405),(19990630232922),(19990601000000),(19990930232922),(19990531232922),(19990501000000),(19991101000000),(19990501000000);
select ix+0 from t1;
ix+0
19991101000000
19990102030405
19990630232922
19990601000000
19990930232922
19990531232922
19990501000000
19991101000000
19990501000000
truncate table t1;
insert into t1 values ("19991101000000"),("19990102030405"),("19990630232922"),("19990601000000");
select ix+0 from t1;
ix+0
19991101000000
19990102030405
19990630232922
19990601000000
drop table t1;
CREATE TABLE t1 (date date, date_time datetime, time_stamp timestamp);
INSERT INTO t1 VALUES ("1998-12-31","1998-12-31 23:59:59",19981231235959);
INSERT INTO t1 VALUES ("1999-01-01","1999-01-01 00:00:00",19990101000000);
INSERT INTO t1 VALUES ("1999-09-09","1999-09-09 23:59:59",19990909235959);
INSERT INTO t1 VALUES ("2000-01-01","2000-01-01 00:00:00",20000101000000);
INSERT INTO t1 VALUES ("2000-02-28","2000-02-28 00:00:00",20000228000000);
INSERT INTO t1 VALUES ("2000-02-29","2000-02-29 00:00:00",20000229000000);
INSERT INTO t1 VALUES ("2000-03-01","2000-03-01 00:00:00",20000301000000);
INSERT INTO t1 VALUES ("2000-12-31","2000-12-31 23:59:59",20001231235959);
INSERT INTO t1 VALUES ("2001-01-01","2001-01-01 00:00:00",20010101000000);
INSERT INTO t1 VALUES ("2004-12-31","2004-12-31 23:59:59",20041231235959);
INSERT INTO t1 VALUES ("2005-01-01","2005-01-01 00:00:00",20050101000000);
INSERT INTO t1 VALUES ("2030-01-01","2030-01-01 00:00:00",20300101000000);
SELECT * FROM t1;
date	date_time	time_stamp
1998-12-31	1998-12-31 23:59:59	1998-12-31 23:59:59
1999-01-01	1999-01-01 00:00:00	1999-01-01 00:00:00
1999-09-09	1999-09-09 23:59:59	1999-09-09 23:59:59
2000-01-01	2000-01-01 00:00:00	2000-01-01 00:00:00
2000-02-28	2000-02-28 00:00:00	2000-02-28 00:00:00
2000-02-29	2000-02-29 00:00:00	2000-02-29 00:00:00
2000-03-01	2000-03-01 00:00:00	2000-03-01 00:00:00
2000-12-31	2000-12-31 23:59:59	2000-12-31 23:59:59
2001-01-01	2001-01-01 00:00:00	2001-01-01 00:00:00
2004-12-31	2004-12-31 23:59:59	2004-12-31 23:59:59
2005-01-01	2005-01-01 00:00:00	2005-01-01 00:00:00
2030-01-01	2030-01-01 00:00:00	2030-01-01 00:00:00
drop table t1;
create table t1 (t2 timestamp(2), t4 timestamp(4), t6 timestamp(6),
t8 timestamp(8), t10 timestamp(10), t12 timestamp(12),
t14 timestamp(14));
Warnings:
Warning	1543	The syntax 'TIMESTAMP(2)' is deprecated and will be removed in MySQL 5.2. Please use 'TIMESTAMP' instead
Warning	1543	The syntax 'TIMESTAMP(4)' is deprecated and will be removed in MySQL 5.2. Please use 'TIMESTAMP' instead
Warning	1543	The syntax 'TIMESTAMP(6)' is deprecated and will be removed in MySQL 5.2. Please use 'TIMESTAMP' instead
Warning	1543	The syntax 'TIMESTAMP(8)' is deprecated and will be removed in MySQL 5.2. Please use 'TIMESTAMP' instead
Warning	1543	The syntax 'TIMESTAMP(10)' is deprecated and will be removed in MySQL 5.2. Please use 'TIMESTAMP' instead
Warning	1543	The syntax 'TIMESTAMP(12)' is deprecated and will be removed in MySQL 5.2. Please use 'TIMESTAMP' instead
Warning	1543	The syntax 'TIMESTAMP(14)' is deprecated and will be removed in MySQL 5.2. Please use 'TIMESTAMP' instead
insert t1 values (0,0,0,0,0,0,0),
("1997-12-31 23:47:59", "1997-12-31 23:47:59", "1997-12-31 23:47:59",
"1997-12-31 23:47:59", "1997-12-31 23:47:59", "1997-12-31 23:47:59",
"1997-12-31 23:47:59");
select * from t1;
t2	t4	t6	t8	t10	t12	t14
0000-00-00 00:00:00	0000-00-00 00:00:00	0000-00-00 00:00:00	0000-00-00 00:00:00	0000-00-00 00:00:00	0000-00-00 00:00:00	0000-00-00 00:00:00
1997-12-31 23:47:59	1997-12-31 23:47:59	1997-12-31 23:47:59	1997-12-31 23:47:59	1997-12-31 23:47:59	1997-12-31 23:47:59	1997-12-31 23:47:59
select * from t1;
t2	t4	t6	t8	t10	t12	t14
0000-00-00 00:00:00	0000-00-00 00:00:00	0000-00-00 00:00:00	0000-00-00 00:00:00	0000-00-00 00:00:00	0000-00-00 00:00:00	0000-00-00 00:00:00
1997-12-31 23:47:59	1997-12-31 23:47:59	1997-12-31 23:47:59	1997-12-31 23:47:59	1997-12-31 23:47:59	1997-12-31 23:47:59	1997-12-31 23:47:59
drop table t1;
create table t1 (ix timestamp);
insert into t1 values (0),(20030101010160),(20030101016001),(20030101240101),(20030132010101),(20031301010101),(20031200000000),(20030000000000);
Warnings:
Warning	1265	Data truncated for column 'ix' at row 2
Warning	1265	Data truncated for column 'ix' at row 3
Warning	1265	Data truncated for column 'ix' at row 4
Warning	1265	Data truncated for column 'ix' at row 5
Warning	1265	Data truncated for column 'ix' at row 6
Warning	1265	Data truncated for column 'ix' at row 7
Warning	1265	Data truncated for column 'ix' at row 8
select ix+0 from t1;
ix+0
0
0
0
0
0
0
0
0
truncate table t1;
insert into t1 values ("00000000000000"),("20030101010160"),("20030101016001"),("20030101240101"),("20030132010101"),("20031301010101"),("20031200000000"),("20030000000000");
Warnings:
Warning	1265	Data truncated for column 'ix' at row 2
Warning	1265	Data truncated for column 'ix' at row 3
Warning	1265	Data truncated for column 'ix' at row 4
Warning	1265	Data truncated for column 'ix' at row 5
Warning	1265	Data truncated for column 'ix' at row 6
Warning	1265	Data truncated for column 'ix' at row 7
Warning	1265	Data truncated for column 'ix' at row 8
select ix+0 from t1;
ix+0
0
0
0
0
0
0
0
0
truncate table t1;
insert into t1 values ("0000-00-00 00:00:00 some trailer"),("2003-01-01 00:00:00 some trailer");
Warnings:
Warning	1265	Data truncated for column 'ix' at row 1
Warning	1265	Data truncated for column 'ix' at row 2
select ix+0 from t1;
ix+0
0
20030101000000
drop table t1;
create table t1 (t1 timestamp, t2 timestamp default now());
ERROR HY000: Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause
create table t1 (t1 timestamp, t2 timestamp on update now());
ERROR HY000: Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause
create table t1 (t1 timestamp, t2 timestamp default now() on update now());
ERROR HY000: Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause
create table t1 (t1 timestamp default now(), t2 timestamp on update now());
ERROR HY000: Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause
create table t1 (t1 timestamp on update now(), t2 timestamp default now() on update now());
ERROR HY000: Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause
create table t1 (t1 timestamp default '2003-01-01 00:00:00', t2 datetime, t3 timestamp);
SET TIMESTAMP=1000000000;
insert into t1 values ();
SET TIMESTAMP=1000000001;
update t1 set t2=now();
SET TIMESTAMP=1000000002;
insert into t1 (t1,t3) values (default, default);
select * from t1;
t1	t2	t3
2003-01-01 00:00:00	2001-09-09 04:46:41	0000-00-00 00:00:00
2003-01-01 00:00:00	NULL	0000-00-00 00:00:00
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `t1` timestamp NOT NULL DEFAULT '2003-01-01 00:00:00',
  `t2` datetime DEFAULT NULL,
  `t3` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00'
) ENGINE=MyISAM DEFAULT CHARSET=latin1
show columns from t1;
Field	Type	Null	Key	Default	Extra
t1	timestamp	NO		2003-01-01 00:00:00	
t2	datetime	YES		NULL	
t3	timestamp	NO		0000-00-00 00:00:00	
drop table t1;
create table t1 (t1 timestamp default now(), t2 datetime, t3 timestamp);
SET TIMESTAMP=1000000002;
insert into t1 values ();
SET TIMESTAMP=1000000003;
update t1 set t2=now();
SET TIMESTAMP=1000000003;
insert into t1 (t1,t3) values (default, default);
select * from t1;
t1	t2	t3
2001-09-09 04:46:42	2001-09-09 04:46:43	0000-00-00 00:00:00
2001-09-09 04:46:43	NULL	0000-00-00 00:00:00
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `t1` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `t2` datetime DEFAULT NULL,
  `t3` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00'
) ENGINE=MyISAM DEFAULT CHARSET=latin1
show columns from t1;
Field	Type	Null	Key	Default	Extra
t1	timestamp	NO		CURRENT_TIMESTAMP	
t2	datetime	YES		NULL	
t3	timestamp	NO		0000-00-00 00:00:00	
drop table t1;
create table t1 (t1 timestamp default '2003-01-01 00:00:00' on update now(), t2 datetime);
SET TIMESTAMP=1000000004;
insert into t1 values ();
select * from t1;
t1	t2
2003-01-01 00:00:00	NULL
SET TIMESTAMP=1000000005;
update t1 set t2=now();
SET TIMESTAMP=1000000005;
insert into t1 (t1) values (default);
select * from t1;
t1	t2
2001-09-09 04:46:45	2001-09-09 04:46:45
2003-01-01 00:00:00	NULL
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `t1` timestamp NOT NULL DEFAULT '2003-01-01 00:00:00' ON UPDATE CURRENT_TIMESTAMP,
  `t2` datetime DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
show columns from t1;
Field	Type	Null	Key	Default	Extra
t1	timestamp	NO		2003-01-01 00:00:00	
t2	datetime	YES		NULL	
drop table t1;
create table t1 (t1 timestamp default now() on update now(), t2 datetime);
SET TIMESTAMP=1000000006;
insert into t1 values ();
select * from t1;
t1	t2
2001-09-09 04:46:46	NULL
SET TIMESTAMP=1000000007;
update t1 set t2=now();
SET TIMESTAMP=1000000007;
insert into t1 (t1) values (default);
select * from t1;
t1	t2
2001-09-09 04:46:47	2001-09-09 04:46:47
2001-09-09 04:46:47	NULL
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `t1` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `t2` datetime DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
show columns from t1;
Field	Type	Null	Key	Default	Extra
t1	timestamp	NO		CURRENT_TIMESTAMP	
t2	datetime	YES		NULL	
drop table t1;
create table t1 (t1 timestamp, t2 datetime, t3 timestamp);
SET TIMESTAMP=1000000007;
insert into t1 values ();
select * from t1;
t1	t2	t3
2001-09-09 04:46:47	NULL	0000-00-00 00:00:00
SET TIMESTAMP=1000000008;
update t1 set t2=now();
SET TIMESTAMP=1000000008;
insert into t1 (t1,t3) values (default, default);
select * from t1;
t1	t2	t3
2001-09-09 04:46:48	2001-09-09 04:46:48	0000-00-00 00:00:00
2001-09-09 04:46:48	NULL	0000-00-00 00:00:00
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `t1` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `t2` datetime DEFAULT NULL,
  `t3` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00'
) ENGINE=MyISAM DEFAULT CHARSET=latin1
show columns from t1;
Field	Type	Null	Key	Default	Extra
t1	timestamp	NO		CURRENT_TIMESTAMP	
t2	datetime	YES		NULL	
t3	timestamp	NO		0000-00-00 00:00:00	
drop table t1;
create table t1 (t1 timestamp default current_timestamp on update current_timestamp, t2 datetime);
SET TIMESTAMP=1000000009;
insert into t1 values ();
select * from t1;
t1	t2
2001-09-09 04:46:49	NULL
SET TIMESTAMP=1000000010;
update t1 set t2=now();
SET TIMESTAMP=1000000011;
insert into t1 (t1) values (default);
select * from t1;
t1	t2
2001-09-09 04:46:50	2001-09-09 04:46:50
2001-09-09 04:46:51	NULL
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `t1` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `t2` datetime DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
show columns from t1;
Field	Type	Null	Key	Default	Extra
t1	timestamp	NO		CURRENT_TIMESTAMP	
t2	datetime	YES		NULL	
truncate table t1;
insert into t1 values ('2004-04-01 00:00:00', '2004-04-01 00:00:00');
SET TIMESTAMP=1000000012;
update t1 set t1= '2004-04-02 00:00:00';
select * from t1;
t1	t2
2004-04-02 00:00:00	2004-04-01 00:00:00
update t1 as ta, t1 as tb set tb.t1= '2004-04-03 00:00:00';
select * from t1;
t1	t2
2004-04-03 00:00:00	2004-04-01 00:00:00
drop table t1;
create table t1 (pk int primary key, t1 timestamp default current_timestamp on update current_timestamp, bulk int);
insert into t1 values (1, '2004-04-01 00:00:00', 10);
SET TIMESTAMP=1000000013;
replace into t1 set pk = 1, bulk= 20;
select * from t1;
pk	t1	bulk
1	2001-09-09 04:46:53	20
drop table t1;
create table t1 (pk int primary key, t1 timestamp default '2003-01-01 00:00:00' on update current_timestamp, bulk int);
insert into t1 values (1, '2004-04-01 00:00:00', 10);
SET TIMESTAMP=1000000014;
replace into t1 set pk = 1, bulk= 20;
select * from t1;
pk	t1	bulk
1	2003-01-01 00:00:00	20
drop table t1;
create table t1 (pk int primary key, t1 timestamp default current_timestamp, bulk int);
insert into t1 values (1, '2004-04-01 00:00:00', 10);
SET TIMESTAMP=1000000015;
replace into t1 set pk = 1, bulk= 20;
select * from t1;
pk	t1	bulk
1	2001-09-09 04:46:55	20
drop table t1;
create table t1 (t1 timestamp default current_timestamp on update current_timestamp);
insert into t1 values ('2004-04-01 00:00:00');
SET TIMESTAMP=1000000016;
alter table t1 add i int default 10;
select * from t1;
t1	i
2004-04-01 00:00:00	10
drop table t1;
create table t1 (a timestamp null, b timestamp null);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` timestamp NULL DEFAULT NULL,
  `b` timestamp NULL DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
insert into t1 values (NULL, NULL);
SET TIMESTAMP=1000000017;
insert into t1 values ();
select * from t1;
a	b
NULL	NULL
NULL	NULL
drop table t1;
create table t1 (a timestamp null default current_timestamp on update current_timestamp, b timestamp null);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `b` timestamp NULL DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
insert into t1 values (NULL, NULL);
SET TIMESTAMP=1000000018;
insert into t1 values ();
select * from t1;
a	b
NULL	NULL
2001-09-09 04:46:58	NULL
drop table t1;
create table t1 (a timestamp null default null, b timestamp null default '2003-01-01 00:00:00');
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` timestamp NULL DEFAULT NULL,
  `b` timestamp NULL DEFAULT '2003-01-01 00:00:00'
) ENGINE=MyISAM DEFAULT CHARSET=latin1
insert into t1 values (NULL, NULL);
insert into t1 values (DEFAULT, DEFAULT);
select * from t1;
a	b
NULL	NULL
NULL	2003-01-01 00:00:00
drop table t1;
create table t1 (a bigint, b bigint);
insert into t1 values (NULL, NULL), (20030101000000, 20030102000000);
set timestamp=1000000019;
alter table t1 modify a timestamp, modify b timestamp;
select * from t1;
a	b
2001-09-09 04:46:59	2001-09-09 04:46:59
2003-01-01 00:00:00	2003-01-02 00:00:00
drop table t1;
create table t1 (a char(2), t timestamp);
insert into t1 values ('a', '2004-01-01 00:00:00'), ('a', '2004-01-01 01:00:00'),
('b', '2004-02-01 00:00:00');
select max(t) from t1 group by a;
max(t)
2004-01-01 01:00:00
2004-02-01 00:00:00
drop table t1;
set sql_mode='maxdb';
create table t1 (a timestamp, b timestamp(19));
show create table t1;
Table	Create Table
t1	CREATE TABLE "t1" (
  "a" datetime DEFAULT NULL,
  "b" datetime DEFAULT NULL
)
set sql_mode='';
drop table t1;
create table t1 (a int auto_increment primary key, b int, c timestamp);
insert into t1 (a, b, c) values (1, 0, '2001-01-01 01:01:01'),
(2, 0, '2002-02-02 02:02:02'), (3, 0, '2003-03-03 03:03:03');
select * from t1;
a	b	c
1	0	2001-01-01 01:01:01
2	0	2002-02-02 02:02:02
3	0	2003-03-03 03:03:03
update t1 set b = 2, c = c where a = 2;
select * from t1;
a	b	c
1	0	2001-01-01 01:01:01
2	2	2002-02-02 02:02:02
3	0	2003-03-03 03:03:03
insert into t1 (a) values (4);
select * from t1;
a	b	c
1	0	2001-01-01 01:01:01
2	2	2002-02-02 02:02:02
3	0	2003-03-03 03:03:03
4	NULL	2001-09-09 04:46:59
update t1 set c = '2004-04-04 04:04:04' where a = 4;
select * from t1;
a	b	c
1	0	2001-01-01 01:01:01
2	2	2002-02-02 02:02:02
3	0	2003-03-03 03:03:03
4	NULL	2004-04-04 04:04:04
insert into t1 (a) values (3), (5) on duplicate key update b = 3, c = c;
select * from t1;
a	b	c
1	0	2001-01-01 01:01:01
2	2	2002-02-02 02:02:02
3	3	2003-03-03 03:03:03
4	NULL	2004-04-04 04:04:04
5	NULL	2001-09-09 04:46:59
insert into t1 (a, c) values (4, '2004-04-04 00:00:00'),
(6, '2006-06-06 06:06:06') on duplicate key update b = 4;
select * from t1;
a	b	c
1	0	2001-01-01 01:01:01
2	2	2002-02-02 02:02:02
3	3	2003-03-03 03:03:03
4	4	2001-09-09 04:46:59
5	NULL	2001-09-09 04:46:59
6	NULL	2006-06-06 06:06:06
drop table t1;
set time_zone= @@global.time_zone;
CREATE TABLE t1 (
`id` int(11) NOT NULL auto_increment,
`username` varchar(80) NOT NULL default '',
`posted_on` timestamp NOT NULL default '0000-00-00 00:00:00',
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1;
show fields from t1;
Field	Type	Null	Key	Default	Extra
id	int(11)	NO	PRI	NULL	auto_increment
username	varchar(80)	NO			
posted_on	timestamp	NO		0000-00-00 00:00:00	
select is_nullable from INFORMATION_SCHEMA.COLUMNS where TABLE_NAME='t1' and COLUMN_NAME='posted_on';
is_nullable
NO
drop table t1;
