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Rewrite the following query so it uses a common table expression (CTE) instead of derived table.

USE AP;
SELECT SUM(InvoiceMax) AS SumOfMaximums
FROM (SELECT VendorID, MAX(InvoiceTotal) AS InvoiceMax
FROM Invoices
WHERE InvoiceTotal - CreditTotal - PaymentTotal > 0
GROUP BY VendorID) AS MaxInvoice;

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Rewrite the following query so it uses a common table expression (CTE) instead of derived table.
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