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sql~(exists和赋值的有关问题)

发布时间: 2012-03-14 12:01:12 作者: rapoo

sql高手请进~~~(exists和赋值的问题)
declare @ID bigint
if exists (select @ID=ID
from dbo.T_D_TA_WareHouseIn
where
MakerItemCD=@MakerItemCD and
Amount=@Amount and
MakeDate=@MakeDate and
BoxNo=@BoxNo and
UseFlag= ' ')
为什么加上@ID就不对呢,赋值的时候不能和exists共用还是怎么回事啊,帮帮忙啊

[解决办法]
declare @ID bigint
select @ID=ID
from dbo.T_D_TA_WareHouseIn
where
MakerItemCD=@MakerItemCD and
Amount=@Amount and
MakeDate=@MakeDate and
BoxNo=@BoxNo and
UseFlag= ' ')
if @ID is null then print '不存在 ' else print cast(@ID as varchar)

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