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SELECT r.customer_id, c.first_name, c.last_name, CEIL(AVG(DATEDIFF(r.return_date, r.rental_date))) AS average_rental_time FROM rental r JOIN customer c ON r.customer_id = c.customer_id GROUP BY r.customer_id, c.first_name, c.last_name ORDER BY r.customer_id ASC; ; show status like 'Last_query_cost';

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