Mysql計算時間差

SELECT TIMESTAMPDIFF(SECOND, now(), "2012-11-11 00:00:00")

 語法為：TIMESTAMPDIFF(unit,datetime1,datetime2)，

 其中unit單位有如下幾種，分別是：FRAC_SECOND (microseconds), SECOND, MINUTE, HOUR, DAY, WEEK, MONTH, QUARTER, or YEAR。