ข้อจำกัด AP/55 คืออะไร ไม่จำเป็นต้องใช้ทุกตาราง
what is restriction AP/55It is not neccessary to use all the tables.
 airport:  airport_code [ varchar]  airport_name [ text]  airport_location [ text]  state_code [ varchar]  country_name [ varchar]  time_zone_code [ varchar]  minimum_connect_time [ int] 
SELECT DISTINCT advance_purchase, application, maximum_stay, minimum_stay, no_discounts, restriction_code, saturday_stay_required, stopovers FROM restriction WHERE restriction_code = 'AP/55'