คุณบิน 747 จากบัลติมอร์ไปซานฟรานซิสโกหรือไม่ ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
do you fly a 747 from BALTIMORE to SAN FRANCISCOIt is not neccessary to use all the tables.
 compartment_class:  compartment [ varchar]  class_type [ varchar] 
SELECT DISTINCT flight.flight_id FROM aircraft, airport_service AS AIRPORT_SERVICE_0, airport_service AS AIRPORT_SERVICE_1, city AS CITY_0, city AS CITY_1, equipment_sequence, flight WHERE (aircraft.basic_type = '747' AND CITY_1.city_code = AIRPORT_SERVICE_1.city_code AND CITY_1.city_name = 'SAN FRANCISCO' AND equipment_sequence.aircraft_code = aircraft.aircraft_code AND flight.aircraft_code_sequence = equipment_sequence.aircraft_code_sequence AND flight.to_airport = AIRPORT_SERVICE_1.airport_code) AND CITY_0.city_code = AIRPORT_SERVICE_0.city_code AND CITY_0.city_name = 'BALTIMORE' AND flight.from_airport = AIRPORT_SERVICE_0.airport_code