從多個表

Question

我有2代表這是選擇Aggregate （（數量*單價）/ 100）*折扣* 100）和AverageFreight =（運費/總項目按順序）*總計行項目爲了

我寫的select語句是這樣的：

select Orders.OrderID,CustomerID, EmployeeID, ProductID,ShippedDate, RequiredDate, ShipVia,(Freight/sum(Quantity))*Quantity 'TotalFreight', 
Quantity * UnitPrice 'LineItemTotal',sum(Quantity) 'Line Item Quantity',sum(((Quantity * UnitPrice)/100) * Discount*100) 'Total Line Discount',Discount from Orders 
inner join [Order Details] on Orders.OrderID = [Order Details].OrderID 
group by Orders.OrderID,Orders.CustomerID, Orders.EmployeeID, [Order Details].ProductID, Orders.RequiredDate, Orders.ShipVia, Orders.Freight, [Order Details].Quantity,[Order Details].UnitPrice, [Order Details].Discount, Orders.ShippedDate 

但是，它不計算AverageFreight權利。我究竟做錯了什麼？

Answer 1

您不需要爲此進行聚合。窗口函數應該足夠了：

select o.*, od.*, 
     (Freight/order_quantity)*Quantity as AllocatedFreight, 
     Quantity * UnitPrice as LineItemTotal, 
     Quantity as [Line Item Quantity], 
     (((Quantity * UnitPrice)/100) * Discount*100) as [Total Line Discount, 
     Discount 
from Orders o inner join 
    (select od.*, sum(quantity) over (partition by od.orderId) as order_quantity 
     from [Order Details] od 
    ) od 
    on o.OrderID = od.OrderID;