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SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER   trigger   [dbo].[checkExamNo] on   [dbo].[student]
  for   insert,update    as  
  if   exists(select   examNo from   student where   isnull(examNo ,'')<>''   group     by   examNo  having   count(*)>1   )  
  rollback


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