Mysql计算时间差

SELECT TIMESTAMPDIFF(SECOND, now(), "2012-11-11 00:00:00") 语法为：TIMESTAMPDIFF(unit,datetime1,datetime2) 其中unit单位有如下几种，分别是：FRAC_SECOND (microseconds), SECOND, MINUTE, HOUR, DAY, WEEK, MONTH, QUARTER, or YEAR。 SELECT user_id TIMESTAMPDIFF(SECOND,date_start,date_end) as date_lag FROM user_match；