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SET SESSION group_concat_max_len = 1000000;; SELECT r.rental_date AS meet_time, i.store_id, GROUP_CONCAT(CONCAT(c.first_name, ' ', c.last_name) ORDER BY c.last_name SEPARATOR ',') AS customers FROM rental r JOIN customer c ON r.customer_id = c.customer_id JOIN inventory i ON r.inventory_id = i.inventory_id GROUP BY r.rental_date, i.store_id HAVING COUNT(c.customer_id) > 1 ORDER BY r.rental_date, i.store_id LIMIT 25; ; show status like 'Last_query_cost';

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