SUBTIME(expr1,expr2)
SUBTIME()返回expr1。expr2表示的值和格式expr1相同。expr1是一个时间或日期时间表达式, expr2是一个时间。
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)