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WITH avg_rental AS ( SELECT ROUND(AVG(DATEDIFF(return_date, rental_date))) as average_rental_time FROM rental ) SELECT film_id, title, ROUND(AVG(DATEDIFF(return_date, rental_date))) as average_rental_time FROM film JOIN inventory USING(film_id) JOIN rental USING(inventory_id) GROUP BY film_id, title HAVING ROUND(AVG(DATEDIFF(return_date, rental_date))) < (SELECT * FROM avg_rental)

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