我的 UPDATE 语句中的逻辑有什么问题？

Question

我将不胜感激有关 UPDATE 语句的帮助。

我想用来自tblCustomer 的内容更新tblOrderHead，其中intDocumentNo 对应于参数@intDocumentNo。但是当我运行 my 语句时，订单表只更新了客户表第一行的内容。

我的逻辑有什么问题？

我使用 Microsoft SQL Server。

谢谢，

斯蒂芬

UPDATE      dbo.tblOrderHead
SET         dbo.tblOrderHead.intCustomerNo   = @intCustomerNo ,
            dbo.tblOrderHead.intPaymentCode  = dbo.tblCustomer.intPaymentCode,
            dbo.tblOrderHead.txtDeliveryCode = dbo.tblCustomer.txtDeliveryCode,
            dbo.tblOrderHead.txtRegionCode   = dbo.tblCustomer.txtRegionCode,
            dbo.tblOrderHead.txtCurrencyCode = dbo.tblCustomer.txtCurrencyCode,
            dbo.tblOrderHead.txtLanguageCode = dbo.tblCustomer.txtLanguageCode
FROM        dbo.tblOrderHead
INNER JOIN  dbo.tblCustomer ON dbo.tblOrderHead.intOrderNo = @intDocumentNo

---

解决方案

如果有人像我一样愚蠢，那么你就是这样解决它的：

UPDATE      dbo.tblOrderHead
SET         dbo.tblOrderHead.intCustomerNo   = @intCustomerNo ,
            dbo.tblOrderHead.intPaymentCode  = dbo.tblCustomer.intPaymentCode,
            dbo.tblOrderHead.txtDeliveryCode = dbo.tblCustomer.txtDeliveryCode,
            dbo.tblOrderHead.txtRegionCode   = dbo.tblCustomer.txtRegionCode,
            dbo.tblOrderHead.txtCurrencyCode = dbo.tblCustomer.txtCurrencyCode,
            dbo.tblOrderHead.txtLanguageCode = dbo.tblCustomer.txtLanguageCode
FROM        dbo.tblOrderHead
INNER JOIN  dbo.tblCustomer ON dbo.tblOrderHead.intCustomerNo = dbo.tblCustomer.intCustomerNo
AND         dbo.tblOrderHead.intOrderNo = @intDocumentNo

Answer 1

问题是，您没有指定tblOrderHead、tblCustomer 2 个表需要连接的条件！

你需要类似的东西

INNER JOIN  dbo.tblCustomer 
ON dbo.tblOrderHead.someColumn = dbo.tblCustomer.someColumn
and dbo.tblOrderHead.intOrderNo = @intDocumentNo