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WITH ranked_films AS ( SELECT c.name AS category, f.title AS film_title, COUNT(r.rental_id) AS rentals_count, RANK() OVER (PARTITION BY c.category_id ORDER BY COUNT(r.rental_id) DESC) AS rn FROM category c JOIN film_category fc ON c.category_id = fc.category_id JOIN film f ON fc.film_id = f.film_id JOIN rental r ON f.film_id = r.film_id WHERE YEAR(r.rental_date) = 2005 GROUP BY c.category_id, c.name, f.film_id, f.title ) SELECT category, GROUP_CONCAT(film_title ORDER BY film_title SEPARATOR ', ') AS most_rented_films, MAX(rentals_count) AS rentals_count FROM ranked_films WHERE rn = 1 GROUP BY category ORDER BY category;

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