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SELECT JSON_ARRAYAGG(JSON_OBJECT(name, film_count)) AS films_by_category FROM ( SELECT c.name, COUNT(f.film_id) AS film_count FROM category c JOIN film_category fc ON c.category_id = fc.category_id JOIN film f ON f.film_id = fc.film_id GROUP BY c.name ) AS sub; ; show status like 'Last_query_cost';

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