โปรดระบุเที่ยวบินจากดัลลาส ฟอร์ตเวิร์ธไปยังวอชิงตัน บัลติมอร์ที่ 7 23 ไม่จำเป็นต้องใช้ตารางทั้งหมด
please list the flights from DALLAS FORT WORTH to WASHINGTON BALTIMORE on 7 23It is not neccessary to use all the tables.
 days:  days_code [ varchar]  day_name [ varchar] 
SELECT DISTINCT flight.flight_id FROM airport_service AS AIRPORT_SERVICE_0, airport_service AS AIRPORT_SERVICE_1, airport_service AS AIRPORT_SERVICE_2, airport_service AS AIRPORT_SERVICE_3, city AS CITY_0, city AS CITY_1, city AS CITY_2, city AS CITY_3, date_day, days, flight WHERE ((CITY_0.city_code = AIRPORT_SERVICE_0.city_code AND CITY_0.city_name = 'DALLAS FORT WORTH' AND flight.from_airport = AIRPORT_SERVICE_0.airport_code) AND ((flight.to_airport = AIRPORT_SERVICE_2.airport_code AND CITY_2.city_code = AIRPORT_SERVICE_2.city_code AND CITY_2.city_name = 'WASHINGTON') OR (flight.to_airport = AIRPORT_SERVICE_3.airport_code AND CITY_3.city_code = AIRPORT_SERVICE_3.city_code AND CITY_3.city_name = 'BALTIMORE'))) AND date_day.day_number = 23 AND date_day.month_number = 7 AND date_day.year = 1991 AND days.day_name = date_day.day_name AND flight.flight_days = days.days_code