以秒为单位获取两个MYSQL datetime列之间的差异

Question

  

可能重复：
  MYSQL - datetime to seconds

如果我在mysql表中有一个datetime列，我怎样才能在几秒钟内得到NOW（）与该列之间的区别？

Answer 1

TIMEDIFF你可以通过秒获得差异

    SELECT TIME_TO_SEC(TIMEDIFF('2007-01-09 10:24:46','2007-01-09 10:23:46'));

或者

SELECT DATEDIFF('2007-12-31 10:02:00','2007-12-30 12:01:01') * 24*60*60;
// result: 86400 the difference in seconds for days.

或：

 SELECT TIMESTAMPDIFF(SECOND,'2007-12-30 12:01:01','2007-12-31 10:02:00'); 
 // result: 79259  the difference in seconds with the time.

Answer 2

试试这个：现在选择（） - my_col AS my_diff