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with rent_cte as ( select staff_id, day(rental_date) as day, count(*) as cnt from rental where rental_date like '2005-05%' group by staff_id, day(rental_date) order by 2 ), return_cte as ( select staff_id, day(return_date) as day, count(*) as cnt2 from rental where return_date like '2005-05%' group by staff_id, day(return_date) ) select * from rent_cte r1 full outer join return_cte r2 on r1.day = r2.day join staff on r1.staff_id = staff.staff_id

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