เครื่องบินประเภทใดที่ออกเดินทางจากบอสตันไปวอชิงตันเวลา 900 น. ในช่วงวันธรรมดาไม่จำเป็นต้องใช้ตารางทั้งหมด
what type of aircraft leaves from BOSTON to WASHINGTON at 900 during a weekdayIt is not neccessary to use all the tables.
 state:  state_code [ text]  state_name [ text]  country_name [ text] 
SELECT DISTINCT aircraft.aircraft_code FROM aircraft, airport_service AS AIRPORT_SERVICE_0, airport_service AS AIRPORT_SERVICE_1, city AS CITY_0, city AS CITY_1, days AS DAYS_0, days AS DAYS_1, days AS DAYS_2, days AS DAYS_3, days AS DAYS_4, equipment_sequence, flight WHERE ((((((DAYS_3.day_name = 'THURSDAY' AND DAYS_4.day_name = 'FRIDAY' AND flight.flight_days = DAYS_3.days_code AND flight.flight_days = DAYS_4.days_code) AND DAYS_2.day_name = 'WEDNESDAY' AND flight.flight_days = DAYS_2.days_code) AND DAYS_1.day_name = 'TUESDAY' AND flight.flight_days = DAYS_1.days_code) AND DAYS_0.day_name = 'MONDAY' AND flight.flight_days = DAYS_0.days_code) AND flight.departure_time = 900) AND CITY_1.city_code = AIRPORT_SERVICE_1.city_code AND CITY_1.city_name = 'WASHINGTON' AND flight.to_airport = AIRPORT_SERVICE_1.airport_code) AND CITY_0.city_code = AIRPORT_SERVICE_0.city_code AND CITY_0.city_name = 'BOSTON' AND equipment_sequence.aircraft_code = aircraft.aircraft_code AND flight.aircraft_code_sequence = equipment_sequence.aircraft_code_sequence AND flight.from_airport = AIRPORT_SERVICE_0.airport_code