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±í      TT
×ֶΠ   A1    A2    A3
      1    B    2008/07/09
      2    C    2008/07/11
      3    B    2009/10/25
A3 ÈÕÆÚºÍ當ǰÈÕÆÚ計Ë㣬B³¬ÆÚ 為10,C³¬ÆÚ為15Ìì

結¹û
          T1    A2    A3            A4
      1    B    2008/07/09    ³¬ÆÚ
          2    C    2008/07/11    ³¬ÆÚ
          3    B    2008/10/25    Õý³£

         

SQL code:
select *,case when datediff(dd,getdate(),A3)<0 then '³¬ÆÚ' else 'Õý³£' end as A4 from TT


SQL code:
select
T1=a1,
a2,
a3,
a4=case when DATEDIFF(DAY,A3,GETDATE())>10 and A2='b' THEN '³¬ÆÚ'
when DATEDIFF(DAY,A3,GETDATE())>15 and A2='C' THEN '³¬ÆÚ' else 'Õý³£' end
from TT


A3 ÈÕÆÚºÍ當ǰÈÕÆÚ計Ë㣬A2 ÖÐ B³¬ÆÚ 為10,C³


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