Question

我正在制作佣金报告，如果订单中包含自定义运费，则需要包含这些报告。下面我加入了两张桌子。如果OrderDetails.Custom包含'Freight'或'Overnight'，我需要它来显示'OrderDetails.CustomPrice'。

如果OrderDetails.Custom不包含'Freight'或'Overnight'我需要将OrderDetails.CustomPrice留空，但只要WHERE显示所有其他字段条款得到满足。

非常感谢任何帮助！

SELECT Orders.OrderDate, Orders.OrderID,      Orders.PaymentAmount, 
       Orders.Shipping,  OrderDetails.Custom, OrderDetails.CustomPrice  
FROM Orders
  JOIN OrderDetails 
    ON OrderDetails.OrderID = Orders.OrderID
WHERE OrderDate BETWEEN '04/01/12 00:00:01' 
                    AND '04/30/12 11:59:59' 
  AND SalesRep_CustomerID = '21140';

Answer 1

您可以通过案例陈述实现您想要的目标：

SELECT Orders.OrderDate, Orders.OrderID, Orders.PaymentAmount, Orders.Shipping, 
CASE WHEN (OrderDetails.Custom = 'Freight' OR OrderDetails.Custom = 'Overnight') THEN OrderDetails.CustomPrice ELSE '' END AS  CustomPrice,
 OrderDetails.CustomPrice  
FROM Orders
JOIN OrderDetails ON OrderDetails.OrderID = Orders.OrderID
WHERE OrderDate BETWEEN '04/01/12 00:00:01' AND '04/30/12 11:59:59' and SalesRep_CustomerID = '21140';

Answer 2

使用case语句获取“CustomPrice”列

的值

初学SQL语句

2 个答案: