MySql 之间的两个时间戳之间的天数差异?

如何以天为单位获得两个时间戳之间的差异?我应该为此使用日期时间列吗?我将我的专栏切换到日期时间.简单的减法似乎不会在几天内给我结果.

How can I get the difference between two timestamps in days? Should I be using a datetime column for this?

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I switched my column to datetime. Simple subtraction doesn't seem to give me a result in days.

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)

我不认为 diff 是以秒为单位的，因为当我将 diff 除以一天中的秒数(86,400)时，我没有得到一个合理的答案:

I don't think diff is in seconds, because when I divide diff by number of seconds in a day ( 86,400 ), I don't get a sensical answer:

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)

SELECT DATEDIFF('2010-10-08 18:23:13', '2010-09-21 21:40:36') AS days;
+------+
| days |
+------+
|   17 |
+------+