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SET SESSION group_concat_max_len = 1000000;; select r.rental_date meet_time , s.store_id , group_concat(distinct concat(c.first_name, ' ', c.last_name) order by c.last_name separator ',') customers from rental r inner join customer c using (customer_id) inner join staff s using (staff_id) group by 1, 2 having count(distinct r.customer_id) > 1 order by 1, 2 ; show status like 'Last_query_cost';

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SQL Result: ( preserve ) Copy Clear

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