删除有相同one_id和other_id的记录，只剩下最新的一条

[流子]

ID one_id other_id relation add_time modify_time


删除有相同one_id和other_id的记录，只剩下modify_time最新的一条，
希望通过一句SQL删除语句，执行后，就只剩下以下的记录：

谢谢大侠们帮忙！

[gw6328]

SELECT * FROM TB A WHERE NOT EXISTS(SELECT 1 FROM TB B WHERE B.ID>A.ID) GROUP BY A.ONE_ID,A.OTHER_ID

[流子]

这个SQL执行不正确

[Quote=引用 1 楼 jinfengyiye 的回复:]

SQL code


SELECT * FROM TB A WHERE NOT EXISTS(SELECT 1 FROM TB B WHERE B.ID>A.ID) GROUP BY A.ONE_ID,A.OTHER_ID
[/Quote]

[ACMAIN_CHM]

delete a from table1 a left join 
	(select one_id,other_id, max(modify_time) as modify_time from table1 group by one_id,other_id) b 
	on a.one_id=b.one_id and a.other_id=b.other_id and a.modify_time=b.modify_time
where b.one_id is null

[ACMAIN_CHM]

当您的问题得到解答后请及时结贴.
http://topic.csdn.net/u/20090501/15/7548d251-aec2-4975-a9bf-ca09a5551ba5.html
http://topic.csdn.net/u/20100428/09/BC9E0908-F250-42A6-8765-B50A82FE186A.html
http://topic.csdn.net/u/20100626/09/f35a4763-4b59-49c3-8061-d48fdbc29561.html

8、如何给分和结贴？
http://community.csdn.net/Help/HelpCenter.htm#结帖

[wwwwb]

DELETE a FROM aab a INNER JOIN aab b ON
a.one_id=b.one_id and a.other_id=b.other_id and a.modify_time<b.modify_time