Question

flag

我无法为ID = 2的客户更新所有LoanAmount，这是消息

子查询返回的值超过1。这是不允许的子查询跟随=，！=，＆lt;，＆lt; =，＆gt;，＆gt; =或当子查询用作表达。

此

的任何解决方案

Answer 1

这是因为跟随子查询会返回多行。

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;

这应该是正确的语法：

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;

此外，请避免使用旧的连接语法，因为它已被弃用。 This question深入讨论。

使用1 FK键更新多行

1 个答案: