sqlplus - 如何选择最高价值

Question

SELECT B.CustomerID, SUM(C.UnitPrice * C.Quantity) AS "Total Value"
FROM Orders B, Order_Det C
WHERE B.OrderID = C.OrderID AND “Total Value” = (SELECT MAX(“Total Value”) FROM Order_Det)
GROUP BY B.CustomerID
ORDER BY "Total Value";

上面的以下代码是我尝试过的。一个客户可以下多个订单。因此，我想通过购买数量和单价的倍数来显示最有价值的客户。我面临的问题是我无法归档谁是最有价值的客户。请指导我。时间

Answer 1

这里是！！

SELECT O.CustomerID, SUM(OD.Quantity*OD.UnitPrice) AS "Total Value"
FROM Orders O
INNER JOIN Order_Det OD ON O.OrderId = OD.OrderId
GROUP BY O.CustomerID
ORDER BY SUM(OD.Quantity*OD.UnitPrice)

或者

SELECT O.CustomerID, SUM(OD.Quantity*OD.UnitPrice) AS "Total Value"
FROM Orders O, Order_Det OD 
WHERE O.OrderId = OD.OrderId
GROUP BY O.CustomerID
ORDER BY SUM(OD.Quantity*OD.UnitPrice)

对于最有价值的客户，

SELECT TOP 1 O.CustomerID
FROM Orders O 
INNER JOIN Order_Det OD ON O.OrderId = OD.OrderId
GROUP BY O.CustomerID
ORDER BY SUM(OD.Quantity*OD.UnitPrice) DESC