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declare @sort_id int

select @sort_id=10

select @sort_id=20 from sysobjects where 1=2

select @sort_id

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ÊÇ 10£¬20 ߀ÊÇ NULL

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 select top 1 @sort_id=c_sort from tb_o_wg (nolock) where c_id=@id and c_adno=@adno
 if isnull(@sort_id,0) = 0 
 begin
  select @msg = \'±¾†ÎÓÐÉÌÆ·²¿éTžéÏÞÖƲ¿éT£¬ÐòÌ–\'+rtrim(ltrim(str(@sort_id)))+\'!\'
  raiserror 99999 @msg
  return(-1)
 end 

 select top 1 @sort_id=c_sort from tb_o_wg (nolock) where c_id=@id and isnull(c_pt_cost,0)=0
 if isnull(@sort_id,0) > 0
 begin
  select @msg = \'±¾†ÎÓПo³É±¾µÄÉÌÆ·£¬ÐòÌ–\'+rtrim(ltrim(str(@sort_id)))+\'!\'
  raiserror 99999 @msg
  return(-1)
 end

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