如何从下面的查询中删除光标？ +

Question

DECLARE @U_CHK TABLE (
      ACCOUNT_ID NUMERIC 
      ,START_NO NUMERIC 
      ,END_NO NUMERIC 
      ,SEQ_NO NUMERIC 
      ,USED INT 
     ) 

DECLARE @ST_NO NUMERIC 
     ,@END_NO NUMERIC 
     ,@ACID NUMERIC 
     ,@SEQ_NO NUMERIC 

DECLARE cCurChk   Scroll CURSOR 
FOR 
    SELECT DISTINCT AC_ID 
      ,ST_DOC_NO  
      ,ST_DOC_NO  
      ,END_DOC_NO  
    FROM AC_LVL_INVEN 
    GROUP BY 
      ST_DOC_NO 
      ,END_DOC_NO  
      ,AC_ID   

OPEN cCurChk 
FETCH NEXT FROM cCurChk INTO @ACID,@ST_NO,@SEQ_NO,@END_NO        
WHILE @@Fetch_Status=0 
BEGIN 
    WHILE (@SEQ_NO<=@END_NO) 
    BEGIN 
     INSERT INTO @U_CHK 
     VALUES 
      (
      @ACID 
      ,@ST_NO 
      ,@END_NO 
      ,@SEQ_NO 
      ,0 
     ) 
     SET @SEQ_NO = @SEQ_NO+1 
END FETCH NEXT FROM cCurChk 
INTO @ACID,@ST_NO,@SEQ_NO,@END_NO 
END CLOSE cCurChk DEALLOCATE cCurChk 

UpDate @U_CHK 
SET USED = 1 FROM @U_CHK Ch INNER JOIN FA_Trans FA(NOLOCK) ON Fa. 
    Account_ID = Ch.Account_ID AND CONVERT(VARCHAR(10) ,Ch.Seq_No) = Fa.Instrument_No 
    WHERE FA.Status>4 AND STATUS<>12 AND Ac_Head_Type<>1 AND Trans_type = 'Debit' 

Answer 1

您可以使用合并语句来替代游标进行插入/更新。下面是一个例子

MERGE dbo.FactBuyingHabits AS Target 
USING (SELECT CustomerID, ProductID, PurchaseDate FROM dbo.Purchases) AS Source 
ON (Target.ProductID = Source.ProductID AND Target.CustomerID = Source.CustomerID) 
WHEN MATCHED THEN 
    UPDATE SET Target.LastPurchaseDate = Source.PurchaseDate 
WHEN NOT MATCHED BY TARGET THEN 
    INSERT (CustomerID, ProductID, LastPurchaseDate) 
    VALUES (Source.CustomerID, Source.ProductID, Source.PurchaseDate) 

看看Technet - Inserting, Updating, and Deleting Data by Using MERGE