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with timeline as ( select distinct case k when 1 then rental_date else return_date end dt from rental, (select 1 k union all select 2) t where customer_id = 1 ) , dts as ( select dt , coalesce(1+sum(case when rental_id is null then 1 end) over(order by dt),1) period_id from timeline tm left join rental r on r.customer_id = 1 and tm.dt >= r.rental_date and tm.dt < r.return_date ) select period_id , min(dt) from_date, max(dt) to_date from dts group by period_id order by 1 ;

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