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questions de base de données en sql

String query = "SELECT r.reservation_no, f.flight_no, r.departure_date, f.departure_time, f.duration FROM flights f, reservations r WHERE f.flight_no=r.flight_no AND r.customer_ssn="?" ";

PreparedStatement ps = connection.prepareStatement(query);
ps.setString(1, customer_ssn);
result = ps.executeQuery();