เครื่องบินประเภทไหน เที่ยวบิน UA 270 จากเดนเวอร์ไปฟิลาเดลเฟียไม่จำเป็นต้องใช้ตารางทั้งหมด
what kind of airplane is flight UA 270 from DENVER to PHILADELPHIAIt is not neccessary to use all the tables.
 time_interval:  period [ text]  begin_time [ int]  end_time [ int] 
SELECT DISTINCT aircraft.aircraft_code FROM aircraft, airport_service AS AIRPORT_SERVICE_0, airport_service AS AIRPORT_SERVICE_1, city AS CITY_0, city AS CITY_1, equipment_sequence, flight WHERE ((CITY_0.city_code = AIRPORT_SERVICE_0.city_code AND CITY_0.city_name = 'DENVER' AND CITY_1.city_code = AIRPORT_SERVICE_1.city_code AND CITY_1.city_name = 'PHILADELPHIA' AND flight.from_airport = AIRPORT_SERVICE_0.airport_code AND flight.to_airport = AIRPORT_SERVICE_1.airport_code) AND flight.flight_number = 270) AND equipment_sequence.aircraft_code = aircraft.aircraft_code AND flight.aircraft_code_sequence = equipment_sequence.aircraft_code_sequence AND flight.airline_code = 'UA'