我有一个查询,我在MySQL中运行,它使用别名从同一列中获取信息两次(来自airport
表的目标)。查询结果在使用别名时显示两次?
`SELECT AirlineName AS 'Airline Name',
airport1.AirportName AS 'Flying From',
airport2.AirportName AS 'Flying To',
StopType AS 'Number of Stops'
FROM flightjunction
INNER JOIN airline ON flightjunction.FlightAirline = airline.AirlineID
INNER JOIN airport AS airport1 ON flightjunction.FlightFrom = airport1.AirportID
INNER JOIN airport AS airport2 ON flightjunction.FlightTo = airport2.AirportID
INNER JOIN stops ON flightjunction.FlightStops = stops.StopID;`
但是,我注意到当我运行此查询时出现重复的结果。我哪里错了?预先感谢您的帮助!
请参阅http://meta.stackoverflow.com/questions/333952/why-should-i-provide-an-mcve-for-what-seems-to-me-to-be-a-very-simple- sql-query – Strawberry