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11. Write a SELECT Statement that uses an aggregate window function to calculate a moving average of the sum of invoice totals. Return these columns:
11. Write a SELECT Statement that uses an aggregate window function to calculate a moving average of the sum of invoice totals. Return these columns:
The month of the invoice date from the Invoices table. The sum of the invoice totals from the Invoices table
The moving average of the invoice totals sorted by invoice month
Result set should be grouped by invoice month and the frame for the moving average should include the current row plus three rows before the current row.
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