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with total_films as ( select count(distinct f.film_id) from film f ) select t2.category, t2.cnt * 100 / (select * from total_films) as relative_rentals_count from ( select c.name as category, count(distinct t1.film_id) as cnt from category c join ( select fc.category_id, f.film_id from film_category fc left join film f on fc.film_id = f.film_id ) t1 on c.category_id = t1.category_id group by category ) as t2

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