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SET SESSION group_concat_max_len = 1000000; SELECT rental.rental_date AS "meet_time", cu.store_id AS "store_id", GROUP_CONCAT(cu.last_name ORDER BY cu.last_name SEPARATOR ', ') AS "customers" FROM customer cu INNER JOIN rental ON cu.customer_id = rental.customer_id INNER JOIN staff ON rental.staff_id = staff.staff_id GROUP BY rental.rental_date, cu.store_id ORDER BY meet_time ASC, store_id ASC;

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