在存儲過程中SQL Server 2005外部連接問題

Question

下午好，

我在SQL Server 2005 DB，Main和MSDRGWEIGHTS中有兩個表。我想創建一個存儲過程，使用來自MSDRGWEIGHTS的適當值更新Main.RelWeight。我寫了下面的代碼作爲存儲過程的一部分：

UPDATE MAIN 
left outer join MSDRGWEIGHTS AS W ON MAIN.MSDRG=W.MSDRG 
SET M.RELWEIGHT = 
CASE 
WHEN M.DISCHARGEDATE BETWEEN 20071001 AND 20080930 THEN W.WEIGHTSOCT07 
WHEN M.DISCHARGEDATE BETWEEN 20081001 AND 20090930 THEN W.WEIGHTSOCT08 
END 
END 
GO 

當我執行這個代碼，我收到錯誤消息，指出近關鍵字左邊不正確的語法。 任何人都可以建議使用存儲過程更新RELWEIGHT的正確方法？或者，這是否超出了sproc的範圍？

感謝， 希德

Answer 1

UPDATE 
      m 
    SET m.RELWEIGHT= CASE 
         WHEN M.DISCHARGEDATE BETWEEN 20071001 AND 20080930 THEN W.WEIGHTSOCT07WHEN 
         WHEN M.DISCHARGEDATE BETWEEN 20081001 AND 20090930 THEN W.WEIGHTSOCT08 
    END 
    FROM 
      MAIN m 
    INNER JOIN MSDRGWEIGHTS mw 
    ON 
    mw.MSDRG = m.MSDRG