ขอเที่ยวบินจากฟีนิกซ์ไปมิลวอกีให้ฉันหน่อย ไม่จำเป็นต้องใช้ตารางทั้งหมด
give me the flights from PHOENIX to MILWAUKEEIt is not neccessary to use all the tables.
 state:  state_code [ text]  state_name [ text]  country_name [ 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 = 'PHOENIX' AND CITY_1.city_code = AIRPORT_SERVICE_1.city_code AND CITY_1.city_name = 'MILWAUKEE' AND flight.from_airport = AIRPORT_SERVICE_0.airport_code AND flight.to_airport = AIRPORT_SERVICE_1.airport_code