คุณช่วยบอกฉันหน่อยได้ไหมว่าคุณมีเที่ยวบินใดจากบัลติมอร์ไปดัลลาซี ไม่จำเป็นต้องใช้ตารางทั้งหมด
can you tell me what flights you have from BALTIMORE to DALLASIt is not neccessary to use all the tables.
 class_of_service:  booking_class [ varchar]  rank [ int]  class_description [ text] 
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, flight WHERE CITY_0.city_code = AIRPORT_SERVICE_0.city_code AND CITY_0.city_name = 'BALTIMORE' AND CITY_1.city_code = AIRPORT_SERVICE_1.city_code AND CITY_1.city_name = 'DALLAS' AND flight.from_airport = AIRPORT_SERVICE_0.airport_code AND flight.to_airport = AIRPORT_SERVICE_1.airport_code