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; -- SELECT distinct c.customer_id -- , c.first_name -- , c.last_name -- , CEIL(AVG(TIMESTAMPDIFF(DAY, rental_date, return_date))) average_rental_time -- FROM rental r -- left JOIN sakila.customer c -- ON c.customer_id = r.customer_id -- GROUP BY c.customer_id -- ORDER BY 1; select rental_id, CEIL(AVG(TIMESTAMPDIFF(DAY, rental_date, return_date))) average_rental_time from rental group by 1

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