SQL 服务器计算列使用分组依据

Question

我正在尝试使用 SSMS 中按外键分组的单独 table 中的 3 列创建计算列。我有一个名为 OrderLines 的链接 table，它链接订单和产品 table。 OrderLines table 包含 RowID(PK)、ItemPrice、Quantity 和 OrderID(FK)。 Orders table 包含 OrderID 的主键，是我想添加 SubTotal 列的 table。所以我需要的公式是（（ItemPricexQuantity）按OrderID分组）但我想不出解决方案。

OrderLines Table

OrdersTable

我已经弄清楚如何使用查询将其作为列获取并可以使用视图创建它，但想知道是否可以将其作为计算列添加到订单 table。

查询是创建我需要的列是：

Select orderid, SUM(itemprice*Quantity)
from orderitems
group by orderID

感谢您的宝贵时间，斯蒂芬

Answer 1

之前的讨论：

create table orderitems 
(
orderId int,
itemid int,
productId int,
itemprice decimal(18,2),
quantity int
)
GO

create table orders
(
orderId int,
shipAmount decimal(18,2),
TaxAmount decimal(18,2)
)
GO

insert into orderitems (orderId,itemid,productId,itemprice,quantity) values
(1,1,2,1199,1),
(2,2,8,489.99,1),
(3,3,1,2517,1),
(3,4,9,415,1),
(4,5,2,1199,1),
(5,6,10,299,1),
(6,7,10,299,1)
GO

insert into orders (orderId,shipAmount,TaxAmount) values
(1,5,58.71),
(2,5,58.72),
(3,10,58.73),
(4,10,58.74),
(5,5,58.75),
(6,5,58.76);
GO

select * from orders
GO

orderId | shipAmount | TaxAmount
------: | :--------- | :--------
      1 | 5.00       | 58.71    
      2 | 5.00       | 58.72    
      3 | 10.00      | 58.73    
      4 | 10.00      | 58.74    
      5 | 5.00       | 58.75    
      6 | 5.00       | 58.76

create function udfMyTable (@orderID  as int)
returns decimal(18, 2)
as
begin
  declare @res as decimal(19, 2);

  Select
    @res = SUM(itemprice*Quantity)
  from orderitems
  where
    orderID = @orderID    

return @res;
end
GO

alter table orderitems add SubTotal as dbo.udfMyTable(orderID)
GO

alter table orders add SubTotal as dbo.udfMyTable(orderID)
GO

Select * from orderitems
GO

orderId | itemid | productId | itemprice | quantity | SubTotal
------: | -----: | --------: | :-------- | -------: | :-------
      1 |      1 |         2 | 1199.00   |        1 | 1199.00 
      2 |      2 |         8 | 489.99    |        1 | 489.99  
      3 |      3 |         1 | 2517.00   |        1 | 2932.00 
      3 |      4 |         9 | 415.00    |        1 | 2932.00 
      4 |      5 |         2 | 1199.00   |        1 | 1199.00 
      5 |      6 |        10 | 299.00    |        1 | 299.00  
      6 |      7 |        10 | 299.00    |        1 | 299.00

select * from orders
GO

orderId | shipAmount | TaxAmount | SubTotal
------: | :--------- | :-------- | :-------
      1 | 5.00       | 58.71     | 1199.00 
      2 | 5.00       | 58.72     | 489.99  
      3 | 10.00      | 58.73     | 2932.00 
      4 | 10.00      | 58.74     | 1199.00 
      5 | 5.00       | 58.75     | 299.00  
      6 | 5.00       | 58.76     | 299.00

db<>fiddle here

Answer 2

我猜你需要下面的东西

select  O.orderID ,sum（itemprice*Quantity）Orders O inner join OrderLines ol 
on O.OrderID=ol.OrderId
group by  O.OrderID

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