从几个事实表中获取维度记录的SUM

Question

我必须在下面查询2个计算正确值的查询：

Select Finances.CustomerID,
sum(Finances.Total)Total
from Finances
group by Finances.CustomerID
order by Finances.CustomerID

---

Select Invoices.CustomerID,
sum(Invoices.InvoiceValue)InvoiceValue
from Invoices
group by Invoices.CustomerID
order by Invoices.CustomerID

在财务表格中，客户可以从多个订单中欠款，因此对于这个例子，我们可以说客户必须支付100英镑+ 400英镑+ 500英镑，总计1000英镑。

然后客户收到100英镑的第一张发票，并支付此费用。

所以第二个查询现在显示100英镑....从这两个值我然后想要计算第三列，从1000英镑中扣除100英镑等于900英镑（剩余金额）

是我的表结构：

还有更多的表关联，但这是我使用select语句的数据：）

我如何编写sql语句来完成所有这些或者不可能？理想情况下，我希望在INSERT中使用 - ＆gt;选择 - ＆gt; WHERE NOT EXISTS语句或者在视图中填充。谢谢你的帮助

示例数据：

Answer 1

CREATE VIEW CustomerFinances AS
    ;WITH FinancesCTE AS
    (
        Select Finances.CustomerID,
        sum(Finances.Total)Total
        from Finances
        group by Finances.CustomerID
    ),InvoicesCTE AS
    (
        Select Invoices.CustomerID,
        sum(Invoices.InvoiceValue)InvoiceValue
        from Invoices
        group by Invoices.CustomerID
    )
    SELECT C.*,
           F.Total AS FinanceTotal,
           I.InvoiceValue
    FROM   Customers C
           LEFT JOIN FinancesCTE F
               ON C.CustomerID = F.CustomerID
           LEFT JOIN InvoicesCTE I
               ON C.CustomerID = I.CustomerID

GO

Answer 2

试试这个，

CREATE VIEW CustomerFinanceDetails AS 
(

 select c.*,isnull(FinanceTotal,0) as FinanceTotal,isnull(InvoiceTotal,0) as InvoiceTotal 
 from 
 (select * from Customers) c
   left outer join 
 (select CustomerID,isnull(SUM(Total),0) as FinanceTotal from Finances group by CustomerID) f on c.CustumerID=f.CustomerID
   left outer join 
 (select CustomerID,isnull(SUM(InvoiceValue),0) as InvoiceTotal from Invoices group by CustomerID) i on c.CustumerID= i.CustomerID

)