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ID1    Name  UpdateDate
1      a    2009-10-1 14:11:39.153
2      b    2009-10-2 14:11:39.153
3      c    2009-10-3 14:11:39.153
±í¶þ
ID2  ID1  UpdateDate
1    a    2009-10-25 14:11:39.153
2    a    2009-10-27 14:11:39.153
3    b    2009-10-30 14:11:39.153
4    c    2009-10-28 14:11:39.153
5    b    2009-10-24 14:11:39.153
6    a    2009-10-29 14:11:39.153

ÒªµÃµ½ÏÂÃæÕâÑùµÄ½á¹û£¬²éѯÔõôд
ID1  Name  UpdateDate
2    b    2009-10-30 14:11:39.153
1    a    2009-10-29 14:11:39.153
3    c    2009-10-28 14:11:39.153
SQL code:
SELECT A.ID1,A.NAME,B.UPDATEDATE
from A ,B T
WHERE A.NAME=B.ID1
AND
NOT EXISTS(SELECT 1 from B WHERE ID1=T.ID1 AND UpdateDate >T.UpdateDate )


SQL code:
select top 3 * from
(select a.id1,b.id1 as name,b.UpdateDate from ±íÒ» a join ±í¶þ b on a.Name=b.id1)t
order by UpdateDate des


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