SQL Subquery

Posted on 2011-09-13
Last Modified: 2012-05-12
I need a query that will return the sum of the largest unpaid invoices for each vendor. The following query returns 22325.39:

SELECT SUM(MaxInvoice)
FROM Invoices JOIN
      (SELECT VendorID, MAX(InvoiceTotal) AS MaxInvoice
      FROM Invoices
      WHERE InvoiceTotal - PaymentTotal - CreditTotal > 0
      GROUP BY VendorID) AS InvoiceSub
      ON Invoices.InvoiceTotal = InvoiceSub.MaxInvoice

However, when I just run the subquery and add a ROLLUP, I get this:

SELECT VendorID, MAX(InvoiceTotal) AS MaxInvoice
      FROM Invoices
      WHERE InvoiceTotal - PaymentTotal - CreditTotal > 0

37      224.00
72      85.31
80      90.36
83      579.42
106      503.20
110      20551.18
123      67.92
NULL      20551.18

This leads me to believe that my complete query isn't correct. Can anyone show me what I did wrong?
Question by:fieldb1
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LVL 32

Accepted Solution

Ephraim Wangoya earned 500 total points
ID: 36533277
SELECT SUM(MaxInvoice)
	SELECT MAX(InvoiceTotal) AS MaxInvoice
	FROM Invoices 
	WHERE InvoiceTotal - PaymentTotal - CreditTotal > 0
) A

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Author Closing Comment

ID: 36533294
Thank you.

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