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with rental_dates as ( select inventory_id, return_date, lead(rental_date) over (partition by inventory_id order by rental_date) next_rental_date from rental where inventory_id in (6,9) and return_date is not null ) SELECT inventory_id,return_date,next_rental_date,(datediff(next_rental_date,return_date)) FROM rental_dates /* select avg(datediff(next_rental_date, return_date)) avg_days_between_rentals from rental_dates where next_rental_date is not null*/

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