Question

我遇到了问题。我有两个表FreshStock和PurchaseInvoiceDetails。

收到新产品时，它会进入PurchaseInvoiceDetails，我也希望它也进入第二个表。

我有代码，该代码首先检查是否未在FreshStock中添加产品，然后首先添加它，但是如果它已经添加了产品，那么它将通过ProductName对其进行更新。更新时出现错误：

信息512，级别16，状态1，第13行
子查询返回的值超过1。当子查询遵循=，！=，<，<=，>，> =或将子查询用作表达式时，不允许这样做。该声明已终止。

我的代码：

IF NOT EXISTS(SELECT * FROM [dbo].[FreshStock] WHERE [ProductName] = 'Makki Rusk')
BEGIN
    INSERT INTO [dbo].[FreshStock] ([ProductCode], [ProductName], [Stock],[IsAvailable])
        SELECT [ProductCode], [ProductName], SUM([Box]), 1
        FROM [dbo].[PurchaseInvoiceDetails]
        WHERE ProductName = 'Makki Rusk'
        GROUP BY [ProductCode],[ProductName]

    RETURN
END

IF  EXISTS(SELECT * FROM [dbo].[FreshStock] WHERE [ProductName] = 'Makki Rusk')
BEGIN
    UPDATE [dbo].[FreshStock]
    SET [ProductCode] = (SELECT [ProductCode] 
                         FROM [dbo].[PurchaseInvoiceDetails] 
                         WHERE [ProductName] = 'Makki Rusk'),
        [ProductName] = (SELECT [ProductName] 
                         FROM [dbo].[PurchaseInvoiceDetails] 
                         WHERE [ProductName] = 'Makki Rusk'),
        [Stock] = (SELECT SUM([Box])  
                   FROM [dbo].[PurchaseInvoiceDetails] 
                   WHERE [ProductName] = 'Makki Rusk')
     WHERE ProductName = 'Makki Rusk'
END

Answer 1

您收到的错误表明以下子查询之一正在返回多行，需要修改以仅返回单行：

[ProductName] = SELECT [ProductCode] FROM [dbo].[PurchaseInvoiceDetails] WHERE [ProductName] = 'Makki Rusk'
[ProductName] = (SELECT [ProductName] FROM [dbo].[PurchaseInvoiceDetails] WHERE [ProductName] = 'Makki Rusk')

Answer 2

您可能不需要重新设置代码和名称，因此只需设置一列：

UPDATE [dbo].[FreshStock]
SET [Stock] = (SELECT SUM([Box])
               FROM [dbo].[PurchaseInvoiceDetails]
               WHERE [ProductName] = 'Makki Rusk'
              )
WHERE  ProductName = 'Makki Rusk';

子查询返回的值超过1个

2 个答案: