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SELECT AVG(DATEDIFF(next_rental_date, return_date)) AS avg_days_between_rentals FROM ( SELECT r1.inventory_id, r1.return_date, MIN(r2.rental_date) AS next_rental_date FROM rental r1 INNER JOIN rental r2 ON r1.inventory_id = r2.inventory_id AND r2.rental_date > r1.return_date GROUP BY r1.inventory_id, r1.return_date ) sub WHERE next_rental_date IS NOT NULL; ; show status like 'Last_query_cost';

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