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SQLize.online is a free online SQL environment for quickly running, experimenting with and sharing code. You can run your SQL code on top of the most popular RDBMS including MySQL, MariaDB, SQLite, PostgreSQL, Oracle and Microsoft SQL Server.

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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) ) 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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