เที่ยวบิน UA 270 จากเดนเวอร์ไปฟิลาเดลเฟีย รับประทานอาหารหรือไม่ ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
does flight UA 270 from DENVER to PHILADELPHIA have a mealIt is not neccessary to use all the tables.
 city:  city_code [ varchar]  city_name [ varchar]  state_code [ varchar]  country_name [ varchar]  time_zone_code [ varchar] 
SELECT DISTINCT food_service.compartment, food_service.meal_code, food_service.meal_number FROM airport_service AS AIRPORT_SERVICE_0, airport_service AS AIRPORT_SERVICE_1, city AS CITY_0, city AS CITY_1, flight, food_service WHERE ((CITY_0.city_code = AIRPORT_SERVICE_0.city_code AND CITY_0.city_name = 'DENVER' AND CITY_1.city_code = AIRPORT_SERVICE_1.city_code AND CITY_1.city_name = 'PHILADELPHIA' AND flight.from_airport = AIRPORT_SERVICE_0.airport_code AND flight.to_airport = AIRPORT_SERVICE_1.airport_code) AND flight.flight_number = 270) AND flight.airline_code = 'UA' AND food_service.meal_code = flight.meal_code