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SET SESSION group_concat_max_len = 1000000; SELECT rental_date AS meet_time, store_id, GROUP_CONCAT(CONCAT(UPPER(first_name), ' ', UPPER(last_name)) ORDER BY last_name, first_name SEPARATOR ', ') AS clients FROM rental r JOIN inventory i ON i.inventory_id = r.inventory_id JOIN customer c ON c.customer_id = r.customer_id group by rental_date, store_id

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