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

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