更新多行與1 FK鍵

UPDATE LoanAccount 
SET LoanAmount = (
     SELECT ((la.LoanAmount * (DATEDIFF(DAY, la.LoanDate, GETDATE()) * (la.InterestRate/la.LoanTerm)))) + la.LoanAmount 
     FROM Customer c, LoanAccount la 
     WHERE c.Customer_ID = la.Customer_ID 
      AND c.AccountNumber = 213451 
     ) 
    , LoanDate = GETDATE() 
WHERE Customer_ID = 2;

我不能更新所有LoanAmount用於與ID = 2，這客戶是消息更新多行與1 FK鍵

子查詢返回大於1倍的值。當子查詢遵循=，！=，<，< =，>，> =或當子查詢用作表達式時，這是不允許的。

此

來源

2015-10-13 Nguyễn Hoàng Lập

子查詢不得返回多於一行。（也許你想確保子選擇中的Customer_ID = 2） – jarlh

你在LoanAccount表中有4行Customer_ID = 2，我想更新該客戶的所有金額，一個客戶可以有很多貸款在我的項目帳戶。 –

這是因爲下面的子查詢返回多行的任何解決方案。

SELECT ((la.LoanAmount * (DATEDIFF(DAY, la.LoanDate, GETDATE()) * (la.InterestRate/la.LoanTerm)))) + la.LoanAmount 
FROM Customer c, LoanAccount la 
WHERE c.Customer_ID = la.Customer_ID 
    AND c.AccountNumber = 213451;

這應該是正確的語法：

UPDATE LA 
SET LA.LoanAmount = ((LA.LoanAmount * (DATEDIFF(DAY, LA.LoanDate, GETDATE()) * (LA.InterestRate/LA.LoanTerm)))) + LA.LoanAmount 
    , LA.LoanDate = GETDATE() 
-- SELECT * 
FROM dbo.LoanAccount AS LA 
INNER JOIN dbo.Customer AS C 
    ON C.Customer_ID = LA.Customer_ID 
WHERE C.Customer_ID = 2 
    AND C.AccountNumber = 2;

另外，請避免使用，因爲它是過時的老聯接語法。 This question深入討論它。

來源

2015-10-13 14:45:52

非常感謝 –

更新多行與1 FK鍵

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