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select avg(days_between_rentals) avg_days_between_rentals from ( select tab.* ,case when return_date is null then 0 else datediff(next_rental_date, return_date) end days_between_rentals from ( select inventory_id ,rental_date ,return_date ,case when lead(rental_date) over(partition by inventory_id order by rental_date) is null then last_update else lead(rental_date) over(partition by inventory_id order by rental_date) end next_rental_date from rental ) tab ) t2

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