ฉันต้องการเที่ยวบินตรงจากฟิลาเดลเฟียไปพิตส์เบิร์ก ไม่จำเป็นต้องใช้ตารางทั้งหมด
i would like a nonstop flight from PHILADELPHIA to PITTSBURGHIt is not neccessary to use all the tables.
 time_interval:  period [ text]  begin_time [ int]  end_time [ int] 
SELECT DISTINCT flight.flight_id FROM airport_service AS AIRPORT_SERVICE_0, airport_service AS AIRPORT_SERVICE_1, city AS CITY_0, city AS CITY_1, flight WHERE (CITY_0.city_code = AIRPORT_SERVICE_0.city_code AND CITY_0.city_name = 'PHILADELPHIA' AND CITY_1.city_code = AIRPORT_SERVICE_1.city_code AND CITY_1.city_name = 'PITTSBURGH' AND flight.from_airport = AIRPORT_SERVICE_0.airport_code AND flight.to_airport = AIRPORT_SERVICE_1.airport_code) AND flight.stops = 0