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select count_departured, count_delayed, round(count_delayed/count_departured*100, 2) delayed_flights_rate from ( select count(flight_id) count_departured, sum(case when date_trunc('seconds', actual_departure-scheduled_departure) > '00:30:00' then 1 else 0 end)::numeric as count_delayed from ( select flight_id, scheduled_departure, actual_departure from flights where actual_departure is not null and departure_airport = 'DME' and date(scheduled_departure) between '2017-08-01' and '2017-08-31') as subq ) subq1

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