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SET SESSION group_concat_max_len = 1000000; 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, c.first_name separator ',') as customers from rental as r join customer as c on c.customer_id = r.customer_id join staff as s on s.staff_id = r.staff_id group by r.rental_date, s.store_id having count(rental_date) >1 order by meet_time, s.store_id

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