Free Online PostgreSQL 10 Bookings (ReadOnly) Playground: Practice & Master SQL Skills

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SELECT * -- (SELECT COUNT(s.seat_no) FROM seats s WHERE s.aircraft_code = f.aircraft_code) AS total_seats, -- COUNT(b.seat_no) AS occupied_seats -- Считаем количество выданных посадочных талонов FROM flights f INNER JOIN boarding_passes b ON f.flight_id = b.flight_id HAVING -- f.flight_no = '30625' (SELECT COUNT(s.seat_no) FROM seats s WHERE s.aircraft_code = f.aircraft_code) = 402 AND COUNT(b.seat_no) = 92 -- GROUP BY -- f.flight_id, f.aircraft_code;

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