我该如何计算两个时间戳之间的天数差?我需要使用datetime列吗?
我将列转换为datetime格式,但是简单的相减似乎不能给出天数差。
mysql> SELECT NOW(), last_confirmation_attempt, NOW() - last_confirmation_attempt AS diff FROM DateClubs HAVING diff IS NOT NULL ;
+---------------------+---------------------------+-----------------+
| NOW() | last_confirmation_attempt | diff |
+---------------------+---------------------------+-----------------+
| 2010-03-30 10:52:31 | 2010-03-16 10:41:47 | 14001084.000000 |
+---------------------+---------------------------+-----------------+
1 row in set (0.00 sec)
我认为diff
不是以秒为单位的,因为当我将diff
除以一天中的秒数(86,400),结果并不合理:
mysql> SELECT NOW(), last_confirmation_attempt, ( NOW() - last_confirmation_attempt) / 86400 AS diff FROM DateClubs HAVING diff IS NOT NULL ;
+---------------------+---------------------------+----------------+
| NOW() | last_confirmation_attempt | diff |
+---------------------+---------------------------+----------------+
| 2010-03-30 10:58:58 | 2010-03-16 10:41:47 | 162.0568402778 |
+---------------------+---------------------------+----------------+
1 row in set (0.00 sec)