SQL - Trying to sum individual orders

Question

I have a database in which:

• 1 customer can place many orders
• 1 Order can contain many line items

the tables I have are

• Customers
• Orders
• Line Items

I want to generate a report that shows me the value of the Orders that have been billed by adding the Line Items.

When I try

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

This seems to give me the individual orders but it gives me the total value of all orders the customer has placed.

Is there a way to show the value of each order individually not the sum of all orders placed?

Update

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

Your query doesn't make sense, because you have tables listed that are not in the from clause. Try this:

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;

Assuming that CustomerNumber is in the Orders table, you don't need the CUstomers table.

Answer 2

Of course, if you group by CustomerNumber it will do so. Get rid of the CustomerNumber in GROUP BY to get all the Orders.