例子：if exists(select * from reporinfo where
reporttitle=@reporttitle)
begin
set @issucess=1
endelse
begin
set @issucess=2
end程式呼叫上述儲存過程時，總是返回0
修改如下：
if exists(select * from reporinfo where
reporttitle=@reporttitle)
begin
set @issucess=1
return @issucess
endelse
begin
set @issucess=2
return @issucess
end則會返回對應的值
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