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ID  ²Í±ð    ʱ¼ä
1  ÖÐ²Í 2009-10-25
2  ÖÐ²Í 2009-10-26
3  Íí²Í 2009-10-26
4  Ôç²Í 2009-10-27

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1  ÖÐ²Í 2009-10-25
3  Íí²Í 2009-10-26
4  Ôç²Í 2009-10-27

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SQL code:

select * from tb a where not exists(select 1 from tb where a.²Í±ð=²Í±ð and a.ʱ¼ä<ʱ¼ä)


SQL code:

--> ²âÊÔÊý¾Ý: @T1
declare @T1 table (ID int,²Í±ð varchar(4),ʱ¼ä datetime)
insert into @T1
select 1,'ÖвÍ','2009-10-25' union all
select 2,'ÖвÍ','2009-10-26' union all
select 3,'Íí²Í','2009-10-26' union all
select 4,'Ôç²Í','2009-10-27'

select * from @t1 a where not exists(select 1 from @t1 where a.²Í±ð=²Í±ð and a.ʱ¼ä> ʱ¼ä)

ID ²Í±ð ʱ¼ä
----------- ---- ------------------------------------------------------
1 ÖÐ²Í 2009-10-25 00:00:00.000
3 Íí²Í 2009-10-26 00:00:00.000
4 Ôç²Í 2009-10-27 00:00:00.000

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