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SET SESSION group_concat_max_len = 1000000; SELECT @row := @row + 1 AS row_number, meet_time, store_id, customers FROM ( SELECT r.rental_date AS meet_time, s.store_id, GROUP_CONCAT(DISTINCT 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 staff s ON r.staff_id = s.staff_id GROUP BY r.rental_date, s.store_id HAVING COUNT(DISTINCT r.customer_id) > 1 ORDER BY r.rental_date, s.store_id ) AS meetings, (SELECT @row := 0) AS counter;

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