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select concat('[',result,']') as films_by_category from ( select GROUP_CONCAT('{', line, '}' SEPARATOR ', ') as result from ( select CONCAT( '"', category, '": ', most_rented_films ) as line from (select c.name as category,count(f.title) as most_rented_films from film f inner join film_category fc using(film_id) inner join category c using(category_id) group by c.name order by category ) as json_line ) as json_single_result ) as json_array ; show status like 'Last_query_cost';

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