mysql 排名次问题
total created
234 2011-08-21 18:22:48
34 2011-08-21 19:20:54
1 2011-08-21 20:02:00
1 2011-08-21 20:00:26
1 2011-08-21 20:00:26
1 2011-08-21 19:44:02
1 2011-08-21 19:34:08
怎按total created 排名次
例如
total created rank
234 2011-08-21 18:22:48 1
34 2011-08-21 19:20:54 2
1 2011-08-21 20:00:26 3
1 2011-08-21 20:02:00 4
1 2011-08-21 19:44:02 5
1 2011-08-21 19:34:08 6