Recording a Row's Creation Time : TimeStamp « Data Type « SQL / MySQL






  1. SQL / MySQL
  2. Data Type
  3. TimeStamp

Recording a Row's Creation Time

      
mysql>
mysql> CREATE TABLE tsdemo2
    -> (
    ->     t_update TIMESTAMP, # record last-modification time
    ->     t_create TIMESTAMP, # record creation time
    ->     val INT
    -> );
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> INSERT INTO tsdemo2 (t_update,t_create,val) VALUES(NULL,NULL,5);
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> SELECT * FROM tsdemo2;
+---------------------+---------------------+------+
| t_update            | t_create            | val  |
+---------------------+---------------------+------+
| 2011-10-03 13:05:52 | 2011-10-03 13:05:52 |    5 |
+---------------------+---------------------+------+
1 row in set (0.00 sec)

mysql>
mysql> UPDATE tsdemo2 SET val = val + 1;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> SELECT * FROM tsdemo2;
+---------------------+---------------------+------+
| t_update            | t_create            | val  |
+---------------------+---------------------+------+
| 2011-10-03 13:05:52 | 2011-10-03 13:05:52 |    6 |
+---------------------+---------------------+------+
1 row in set (0.00 sec)

mysql>
mysql> drop table tsdemo2;
Query OK, 0 rows affected (0.00 sec)








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1.TIMESTAMP as column type
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4.Order by timestamp value
5.dates and times in SQL commands must be given as character strings,
6.Recording a Row's Last Modification Time
7.Performing Calculations with TIMESTAMP Values
8.Updates to tsdemo2 records that don't actually modify a column cause no change to TIMESTAMP values
9.Create a table in which timestamps can be stored.
10.The difference between the creation and modification times
11.Issuing an UPDATE statement that doesn't actually change the values in the val column doesn't update the TIMES
12.microseconds component is removed.