แสดงเที่ยวบินทั้งหมดจากฟิลาเดลเฟียไปซินซินเนติ ไม่จำเป็นต้องใช้ตารางทั้งหมด
show me all the flights from PHILADELPHIA to CINCINNATIIt is not neccessary to use all the tables.
 dual_carrier:  main_airline [ varchar]  low_flight_number [ int]  high_flight_number [ int]  dual_airline [ varchar]  service_name [ text] 
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 = 'CINCINNATI' AND flight.from_airport = AIRPORT_SERVICE_0.airport_code AND flight.to_airport = AIRPORT_SERVICE_1.airport_code