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SELECT rental_date, IFNULL(return_date, CURRENT_TIMESTAMP) AS return_date, @prev_return := LAG(IFNULL(return_date, CURRENT_TIMESTAMP)) OVER (ORDER BY rental_date) AS prev_return FROM customer c left join inventory i ON c.store_id=i.store_id left join rental r ON r.inventory_id=i.inventory_id left join film f on i.film_id=f.film_id WHERE c.customer_id = 1

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