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select COUNT(*) count_departured, SUM(case when actual_departure-scheduled_departure>'00:30:00' then 1 else 0 end) count_delayed, round(SUM(case when actual_departure-scheduled_departure>'00:30:00' then 1 else 0 end)*100.00/COUNT(*), 2) delayed_flights_rate from flights where departure_airport='DME' and to_char(scheduled_departure, 'YYYY-MM')='2017-08' and status='Arrived'

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