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SELECT CONCAT( '[', GROUP_CONCAT( JSON_ARRAY( 'id', id, 'title', title, 'category', category ) ORDER BY id ), ']' ) AS film FROM ( SELECT film_id AS id, title, name AS category FROM category JOIN film_category USING(category_id) JOIN film USING(film_id) ) AS films; ; show status like 'Last_query_cost';

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