按日期时间命令mysql

Question

我有一个包含datetime字段类型的表,我想对select语法进行排序取决于它的降序,如下所示:

2012-12-12 01:44:20

2012-12-11 01:44:40

2012-12-10 01:40:36

2012-12-09 12:28:19

2012-12-09 12:19:21

2012-12-09 12:11:50

2012-12-09 12:00:11

2012-12-09 11:59:26

2012-12-09 11:57:08

2012-12-09 11:55:21

Answer 1

ORDER BY columnname DESC

TA-DAH!

Answer 2

ORDER BY UNIX_TIMESTAMP(columnname) DESC

这UNIX_TIMESTAMP是必需的,因为mysql将它们测试为字符串(ex 9:00出现在后面16:00)