必須在SQL聲明標量變量....與輸入和輸出參數

Question

我有SP上得到USER_ID作爲輸入，並從表中獲取GROUP_ID，但它顯示錯誤，當我試圖運行它：

必須聲明標量變量@Group_i

我的存儲過程：

Alter PROCEDURE [dbo].[DisplayDetails] 

@User_Id int, 
@Group_Id int OUTPUT 

AS 
BEGIN 
-- SET NOCOUNT ON added to prevent extra result sets from 
-- interfering with SELECT statements. 
SET NOCOUNT ON; 

Begin 
-- Insert statements for procedure here 
SELECT 
@Group_Id=(select distinct(Group_Id) from input_files_updated) 
from INPUT_FILES_updated where [User_Id]=@User_Id 

END 
END 

GO 

查詢執行SP：

Declare @Group_I int  

Execute [dbo].[DisplayDetails] @User_Id='3',  
@Group_Id=@Group_I out 

爲什麼我得到這個錯誤？你的

Answer 1

一點點固定查詢：

Alter PROCEDURE [dbo].[DisplayDetails] 
    @User_Id int, 
    @Group_Id int OUTPUT 
AS 
BEGIN 
SET NOCOUNT ON; 

SELECT @Group_Id = (
    select top 1 Group_Id 
    from INPUT_FILES_updated 
    where [User_Id]=@User_Id 
) 

RETURN 
END 

我記得必須有SP一句話RETURN。然後嘗試：

Declare @Group_I int  

Execute [dbo].[DisplayDetails] @User_Id=3, @Group_Id=@Group_I output 

SELECT @Group_I