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SELECT COUNT(s.seat_no) AS total_seats, COUNT(b.seat_no) AS occupied_seats FROM flights f INNER JOIN seats s ON s.aircraft_code = f.aircraft_code -- AND f.flight_no = 30625 LEFT JOIN boarding_passes b ON f.flight_id = b.flight_id WHERE f.flight_no = '30625' -- GROUP BY -- flight_no ; select * from query_cost('SELECT COUNT(s.seat_no) AS total_seats, COUNT(b.seat_no) AS occupied_seats FROM flights f INNER JOIN seats s ON s.aircraft_code = f.aircraft_code -- AND f.flight_no = 30625 LEFT JOIN boarding_passes b ON f.flight_id = b.flight_id WHERE f.flight_no = ''30625'' -- GROUP BY -- flight_no');

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