SUBTIME(expr1,expr2)

SUBTIME()返回expr1。expr2表示的值和格式expr1相同。expr1是一個時間或日期時間表達式， expr2是一個時間。

mysql> SELECT SUBTIME('1997-12-31 23:59:59.999999',
    -> '1 1:1:1.000002');
+---------------------------------------------------------+
| SUBTIME('1997-12-31 23:59:59.999999'...                 |
+---------------------------------------------------------+
| 1997-12-30 22:58:58.999997                              |
+---------------------------------------------------------+
1 row in set (0.00 sec)