SQL - 尝试对各个订单求和

Question

我有一个数据库，其中包含：

• 1位客户可以下订单
• 1订单可包含多个订单项

我所拥有的表格

• 客户
• 订单
• 订单项

我想生成一个报告，向我显示通过添加订单项计费的订单的价值。

当我尝试

时

SELECT Customers.CustomerNumber, Orders.OrderNumber, 
    SUM(LineItems.ItemPrice * LineItems.QuantityOrdered) AS 'Order Value'
FROM LineItems.ItemNumber
WHERE Customers.CustomerNumber = '1234'
GROUP BY Orders.OrderNumber, Customers.CustomerNumber

这似乎给了我个人订单，但它给了我客户所有订单的总价值。

有没有办法单独显示每个订单的价值而不是所有订单的总和？

更新

SELECT
    Agreement.AgreementNumber AS 'Agreement Number', 
    POBase.PurchaseOrderNumber AS 'Purchase Order Number',
    SUM(POLI.UsedPrice * POLI.QuantityOrdered) AS 'Billed Amount'

FROM MyDatabase..PurchaseOrderLineItemBase AS POLI
INNER JOIN 
    MyDatabase..AgreementBase AS Agreement
    ON POLI.AgreementKey = Agreement.AgreementKey
INNER JOIN
    MyDatabase..PurchaseOrderBase AS POBase
    ON POLI.AgreementKey = POBase.AgreementKey
WHERE 
    (Agreement.AgreementNumber = '1234'
    OR Agreement.AgreementNumber =  '234')
    AND POLI.POLineItemStatusName = 'Invoiced'
GROUP BY 
    POBase.AgreementKey,
    POBase.PurchaseOrderNumber,
    Agreement.AgreementNumber
ORDER BY 
    Agreement.AgreementNumber

Answer 1

您的查询没有意义，因为您列出的表不在from子句中。试试这个：

SELECT o.CustomerNumber, o.OrderNumber, 
       SUM(li.ItemPrice * li.QuantityOrdered) AS 'Order Value'
FROM orders o JOIN
     LineItems li
     ON o.OrderNumber = li.OrderNumber
WHERE o.CustomerNumber = '1234'
GROUP BY o.OrderNumber, o.CustomerNumber;

假设CustomerNumber在Orders表中，您不需要CUstomers表。

Answer 2

当然，如果按CustomerNumber分组，它会这样做。摆脱GROUP BY中的CustomerNumber以获取所有订单。