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WITH RentalIntervals AS ( -- Use LEAD to get the rental_date of the next rental for the same drive SELECT rental_id, return_date, LEAD(rental_date) OVER (PARTITION BY rental_id ORDER BY rental_date) AS next_rental_date FROM rental HAVING COUNT(rental_id) > 1) -- Calculate the difference in days and then the average SELECT AVG(DATEDIFF(next_rental_date, return_date)) AS avg_days_between_rentals FROM RentalIntervals WHERE next_rental_date IS NOT NULL AND DATEDIFF(next_rental_date, return_date) >= 0; -- Ensure the next rental is not before the return

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