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select clase, count (clase) from (select flight_no , sum(amount), case when sum(amount) < 50000000 then 'low' when sum(amount) between 50000000 and 150000000 then 'middle' when sum(amount) > 150000000 then 'high' end clase from ticket_flights tf join flights f on tf.flight_id =f.flight_id group by flight_no) ggg group by clase

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