统计用户最小登陆时间

有如下数据：
bullet 2010-02-05 13:51:46
bullet 2010-02-06 08:27:56
bullet 2010-02-06 13:44:15
bullet 2010-02-07 20:50:25
bullet 2010-02-08 12:22:29
bullet 2010-02-08 12:55:04
bullet 2010-02-09 07:48:48
bullet 2010-02-09 09:53:30
bullet 2010-02-09 09:54:48
bullet 2010-02-09 19:10:33
bullet 2010-02-09 20:16:25
bullet 2010-02-10 00:38:33
bullet 2010-02-10 06:00:51
bullet 2010-02-10 09:05:13
buyutiandi 2009-11-18 15:49:13
buyutiandi 2009-11-18 16:22:13
buyutiandi 2009-11-18 16:23:05
buyutiandi 2009-11-18 16:25:54
buyutiandi 2009-11-18 16:50:25
buyutiandi 2009-11-18 16:51:47
buyutiandi 2009-11-18 16:53:46
buyutiandi 2009-11-18 16:56:07
buyutiandi 2009-11-18 16:56:33
buyutiandi 2009-11-18 17:00:22
buyutiandi 2009-11-18 17:01:25
buyutiandi 2009-11-18 17:02:11
buyutiandi 2009-11-18 17:04:22
如何用SQL语句实现查找出两次登陆时间的最小间隔<10秒的用户有那些？？（以上数据只是例子的几条）