ฉันอยากบินจากเดนเวอร์ไปบอสตันในวันพุธที่ 21 จาก 4 ไม่จำเป็นต้องใช้ตารางทั้งหมด
i would like to fly from DENVER to BOSTON on wednesday the 21 of 4It 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 flight.flight_id FROM airport_service AS AIRPORT_SERVICE_0, airport_service AS AIRPORT_SERVICE_1, city AS CITY_0, city AS CITY_1, date_day, days, flight WHERE (CITY_1.city_code = AIRPORT_SERVICE_1.city_code AND CITY_1.city_name = 'BOSTON' AND date_day.day_number = 21 AND date_day.month_number = 4 AND date_day.year = 1991 AND days.day_name = date_day.day_name AND flight.flight_days = days.days_code AND flight.to_airport = AIRPORT_SERVICE_1.airport_code) AND CITY_0.city_code = AIRPORT_SERVICE_0.city_code AND CITY_0.city_name = 'DENVER' AND flight.from_airport = AIRPORT_SERVICE_0.airport_code