TAMP values.
mysql>
mysql> CREATE TABLE tsdemo1
-> (
-> t TIMESTAMP,
-> val INT
-> );
Query OK, 0 rows affected (0.01 sec)
mysql>
mysql> INSERT INTO tsdemo1 (t,val) VALUES(NULL,5);
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO tsdemo1 (val) VALUES(10);
Query OK, 1 row affected (0.00 sec)
mysql>
mysql> SELECT * FROM tsdemo1;
+---------------------+------+
| t | val |
+---------------------+------+
| 2011-10-03 13:05:52 | 5 |
| 2011-10-03 13:05:52 | 10 |
+---------------------+------+
2 rows in set (0.00 sec)
mysql>
mysql> UPDATE tsdemo1 SET val = 6 WHERE val = 5;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> SELECT * FROM tsdemo1;
+---------------------+------+
| t | val |
+---------------------+------+
| 2011-10-03 13:05:52 | 6 |
| 2011-10-03 13:05:52 | 10 |
+---------------------+------+
2 rows in set (0.00 sec)
mysql>
mysql>
mysql> UPDATE tsdemo1 SET val = val + 0;
Query OK, 0 rows affected (0.00 sec)
Rows matched: 2 Changed: 0 Warnings: 0
mysql> SELECT * FROM tsdemo1;
+---------------------+------+
| t | val |
+---------------------+------+
| 2011-10-03 13:05:52 | 6 |
| 2011-10-03 13:05:52 | 10 |
+---------------------+------+
2 rows in set (0.00 sec)
mysql>
mysql> drop table tsdemo1;
Query OK, 0 rows affected (0.00 sec)
mysql>