ค่าโดยสารจาก PHILADELPHIA ถึงชั้น PITTSBURGH BUSINESS เป็นเท่าใด เที่ยวเดียวไม่จำเป็นต้องใช้ตารางทั้งหมด
what is the fare from PHILADELPHIA to PITTSBURGH BUSINESS class one wayIt 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 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, fare_basis 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 fare.from_airport = AIRPORT_SERVICE_0.airport_code AND fare.to_airport = AIRPORT_SERVICE_1.airport_code) AND fare.round_trip_required = 'NO') AND fare_basis.class_type = 'BUSINESS' AND fare.fare_basis_code = fare_basis.fare_basis_code