删除数据库几天前的数据

 

删除3天前数据

delete from liuyan where datediff(curdate(), time) > 3

　　DATEDIFF() 函数返回两个日期之间的天数。

例子：

SELECT DATEDIFF('2008-12-30','2008-12-29') AS DiffDate
返回1

SELECT DATEDIFF('2008-12-29','2008-12-30') AS DiffDate
返回-1

　　CURDATE() 函数返回当前的日期。

SELECT NOW(),CURDATE(),CURTIME()