TRUNCATE(x,y)返回数值x保留到小数点后y位的值(与ROUND最大的区别是不会进行四舍五入),请看下面实例:
mysql>SELECT TRUNCATE(7.536432,2);+---------------------------------------------------------+| TRUNCATE(7.536432,2) |+---------------------------------------------------------+| 7.53 |+---------------------------------------------------------+1 row in set (0.00 sec)