Comments on: Difference between datetime and timestamp in MySQL https://www.dbrnd.com/2015/09/difference-between-datetime-and-timestamp-in-mysql/ BIGData | NoSQL | MSSQL | MySQL | PostgreSQL Thu, 30 May 2019 19:17:10 +0000 hourly 1 https://wordpress.org/?v=7.0.4 By: Flimm https://www.dbrnd.com/2015/09/difference-between-datetime-and-timestamp-in-mysql/#comment-7255 Thu, 30 May 2019 19:17:10 +0000 https://www.dbrnd.com/?p=505#comment-7255 The last code example is wrong. If you update a row to change the ID column, the other columns have no reason to change unless the columns were defined with an “ON UPDATE…” clause, which they weren’t. Please try running the queries and see for yourself.

]]> By: iceage https://www.dbrnd.com/2015/09/difference-between-datetime-and-timestamp-in-mysql/#comment-4729 Thu, 05 May 2016 01:58:14 +0000 https://www.dbrnd.com/?p=505#comment-4729 TIMESTAMP used to track changes to records, and update every time when the record is changed，
‘timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP’ make it;

select version();
+————+
| version() |
+————+
| 5.6.28-log |
+————+

09:46:02 scott> create table t1 (id int,dt datetime,ts timestamp);
Query OK, 0 rows affected (0.01 sec)

09:46:31 scott> insert into t1 values (1,now(),now());
Query OK, 1 row affected (0.01 sec)

09:46:47 scott> select * from t1;
+——+———————+———————+
| id | dt | ts |
+——+———————+———————+
| 1 | 2016-05-05 09:46:47 | 2016-05-05 09:46:47 |
+——+———————+———————+
1 row in set (0.00 sec)

09:46:54 scott> update t1 set id=2;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0

09:47:03 scott> select * from t1;
+——+———————+———————+
| id | dt | ts |
+——+———————+———————+
| 2 | 2016-05-05 09:46:47 | 2016-05-05 09:47:03 |
+——+———————+———————+
1 row in set (0.00 sec)

09:47:05 scott> show create table t1;
+——-+————————————————————————————–+
| Table | Create Table |
+——-+————————————————————————————–+
| t1 | CREATE TABLE t1 (
id int(11) DEFAULT NULL,
dt datetime DEFAULT NULL,
ts timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=gbk |
+——-+————————————————————————————–+
1 row in set (0.00 sec)

09:48:07 scott> create table t2 (id int,dt datetime,ts timestamp null);
Query OK, 0 rows affected (0.01 sec)

09:48:45 scott> show create table t2;
+——-+————————————————————————————-+
| Table | Create Table |
+——-+————————————————————————————-+
| t2 | CREATE TABLE t2 (
id int(11) DEFAULT NULL,
dt datetime DEFAULT NULL,
ts timestamp NULL DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=gbk |
+——-+————————————————————————————-+
1 row in set (0.00 sec)

09:48:52 scott> insert into t2 values (1,now(),now());
Query OK, 1 row affected (0.00 sec)

09:49:05 scott> select * from t2;
+——+———————+———————+
| id | dt | ts |
+——+———————+———————+
| 1 | 2016-05-05 09:49:05 | 2016-05-05 09:49:05 |
+——+———————+———————+
1 row in set (0.00 sec)

09:49:11 scott> update t2 set id=2;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0

09:49:19 scott> select * from t2;
+——+———————+———————+
| id | dt | ts |
+——+———————+———————+
| 2 | 2016-05-05 09:49:05 | 2016-05-05 09:49:05 |
+——+———————+———————+

]]> By: Anvesh Patel https://www.dbrnd.com/2015/09/difference-between-datetime-and-timestamp-in-mysql/#comment-427 Fri, 27 Nov 2015 04:37:07 +0000 https://www.dbrnd.com/?p=505#comment-427 Thanks Monika for such a nice comment !
For any queries you can direct contact me at anvesh@dbrnd.com

]]> By: Monika https://www.dbrnd.com/2015/09/difference-between-datetime-and-timestamp-in-mysql/#comment-426 Fri, 27 Nov 2015 02:04:45 +0000 https://www.dbrnd.com/?p=505#comment-426 Nice post !. Guys I am telling you, Anvesh is one of the next big person in Database Technology. He has just started blog and very popular in couple of months. Anvesh I can see your future after 3 to 4 year, you will be next to Pinal Dave(SQL Server Specialist).
I am also Senior Database Architecture.
Thanks for the help !

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