SEC_TO_TIME(seconds) 有大用

返回秒参数，转化为小时，分钟和秒的值，格式如'HH:MM:SS'或HHMMSS，根据该函数是否用在字符串或数字语境中。

mysql> SELECT SEC_TO_TIME(2378);
+---------------------------------------------------------+
| SEC_TO_TIME(2378)                                       |
+---------------------------------------------------------+
| 00:39:38                                                |
+---------------------------------------------------------+
1 row in set (0.00 sec)

+---------------------------------------------------------+
| SEC_TO_TIME(2378)                                       |
+---------------------------------------------------------+
| 00:39:38                                                |
+---------------------------------------------------------+
1 row in set (0.00 sec)