US 3724 BALTIMORE ถึง PHILADELPHIA ค่าโดยสารไปกลับคือเท่าไร ไม่จำเป็นต้องใช้ตารางทั้งหมด
US 3724 BALTIMORE to PHILADELPHIA what is the round trip fareIt is not neccessary to use all the tables.
 state:  state_code [ text]  state_name [ text]  country_name [ text] 
SELECT DISTINCT fare.fare_id FROM airport_service AS AIRPORT_SERVICE_0, airport_service AS AIRPORT_SERVICE_1, city AS CITY_0, city AS CITY_1, fare, flight, flight_fare WHERE ((CITY_0.city_code = AIRPORT_SERVICE_0.city_code AND CITY_0.city_name = 'BALTIMORE' 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 = 3724) AND NOT fare.round_trip_cost IS NULL AND flight_fare.fare_id = fare.fare_id AND flight.airline_code = 'US' AND flight.flight_id = flight_fare.flight_id