เที่ยวบินจาก LGA หรือ JFK ไปยัง CLEVELAND ไม่จำเป็นต้องใช้ตารางทั้งหมด
flights from LGA or JFK to CLEVELANDIt is not neccessary to use all the tables.
 aircraft:  aircraft_code [ varchar]  aircraft_description [ varchar]  manufacturer [ varchar]  basic_type [ varchar]  engines [ int]  propulsion [ varchar]  wide_body [ varchar]  wing_span [ int]  length [ int]  weight [ int]  capacity [ int]  pay_load [ int]  cruising_speed [ int]  range_miles [ int]  pressurized [ varchar] 
SELECT DISTINCT flight.flight_id FROM airport AS AIRPORT_0, airport AS AIRPORT_1, airport_service, city, flight WHERE ((flight.from_airport = AIRPORT_0.airport_code AND AIRPORT_0.airport_code = 'JFK') OR (flight.from_airport = AIRPORT_1.airport_code AND AIRPORT_1.airport_code = 'LGA')) AND city.city_code = airport_service.city_code AND city.city_name = 'CLEVELAND' AND flight.to_airport = airport_service.airport_code