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Task

Average Weekly Rentals

MySQL
Find the average number of disks rented by each customer in August 2005, broken down by week. 
Present the result in two columns: week_num - week number, weekly_average_rental_count - the average number of discs rented by one user. 
Sort the results by week number.
Expected result Columns: 2 · Rows: 3
week_num weekly_average_rental_count

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