ค่าโดยสารจากซานฟรานซิสโกไป DALLAS FORT WORTH บนเที่ยวบิน DL 852 เป็นเท่าใด ไม่จำเป็นต้องใช้ตารางทั้งหมด
what is the fare from SAN FRANCISCO to DALLAS FORT WORTH on DL flight 852It is not neccessary to use all the tables.
 aircraft:  aircraft_code [ varchar]  aircraft_description [ varchar]  manufacturer [ varchar]  basic_type [ varchar]  engines [ int]  propulsion [ varchar]  wide_body [ varchar]  wing_span [ int]  length [ int]  weight [ int]  capacity [ int]  pay_load [ int]  cruising_speed [ int]  range_miles [ int]  pressurized [ varchar] 
SELECT DISTINCT fare.fare_id FROM airport_service AS AIRPORT_SERVICE_0, airport_service AS AIRPORT_SERVICE_1, airport_service AS AIRPORT_SERVICE_2, city AS CITY_0, city AS CITY_1, city AS CITY_2, fare, flight, flight_fare WHERE (((CITY_1.city_code = AIRPORT_SERVICE_1.city_code AND CITY_1.city_name = 'DALLAS' AND CITY_2.city_code = AIRPORT_SERVICE_2.city_code AND CITY_2.city_name = 'FORT WORTH' AND flight.to_airport = AIRPORT_SERVICE_1.airport_code AND flight.to_airport = AIRPORT_SERVICE_2.airport_code) AND flight.flight_number = 852) AND CITY_0.city_code = AIRPORT_SERVICE_0.city_code AND CITY_0.city_name = 'SAN FRANCISCO' AND flight.from_airport = AIRPORT_SERVICE_0.airport_code) AND flight_fare.fare_id = fare.fare_id AND flight.airline_code = 'DL' AND flight.flight_id = flight_fare.flight_id