MAKETIME(hour,minute,second)

返回从给小时，分钟和第二个参数计算出的时间值。

mysql> SELECT MAKETIME(12,15,30);
+---------------------------------------------------------+
| MAKETIME(12,15,30)                                      |
+---------------------------------------------------------+
| '12:15:30'                                              |
+---------------------------------------------------------+
1 row in set (0.00 sec)