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with cte_t as ( select *, lead(rental_date) over (order by rental_date) > return_date y from rental where customer_id = 1 order by rental_date ) /* select row_number() over (order by rental_id) as period_id , rental_date as from_date , case when nd is null then (select max(return_date) from cte_t) else (select max(return_date) from cte_t where return_date < nd) end as to_date from ( select *, lead(rental_date) over () nd from cte_t where y = 1 ) t*/ select rental_id, rental_date, 'b' t from cte_t union all select rental_id, return_date, 'e' t order by 2

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