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b 2010-05-28 00:00:00.000 2010-05-31 00:00:00.000 0.5
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a 2010-05-01 00:00:00.000 2010-05-03 00:00:00.000 0.4
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select * from tb t where not exists (
select 1 from tb where t.ÐÕÃû=ÐÕÃû
and datediff(m,t.Åàѵ½áÊøÊ±¼ä,Åàѵ½áÊøÊ±¼ä)=0
and t.Åàѵ½áÊøÊ±¼ä>=Åàѵ½áÊøÊ±¼ä
and t.Åàѵ¿ªÊ¼Ê±¼ä>Åàѵ¿ªÊ¼Ê±¼ä
)

/*
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