使用派生表从具有相同名称的不同表中选择列

Question

我正在尝试提取名称为“ BEIJING”的所有可能的机场，但是由于“ Airplanes.name”和“ Airport.name”，我一直收到列名重复的错误。如何更改逻辑？

SELECT * FROM 
(SELECT Airplanes.name, Airport.name
FROM Airplanes, Airport
WHERE Airplanes.Airport = Airport.id) RESULT
WHERE RESULT.name = "BEIJING";```

Answer 1

只需将列别名添加到您的子查询中：

SELECT * FROM 
(SELECT Airplanes.name AS airplane, Airport.name AS airport
FROM Airplanes, Airport
WHERE Airplanes.Airport = Airport.id) RESULT
WHERE RESULT.airport = "BEIJING"

请注意，您实际上应该更新为现代JOIN语法：

SELECT * FROM 
(SELECT Airplanes.name AS airplane, Airport.name AS airport
FROM Airplanes
JOIN Airport ON Airplanes.Airport = Airport.id) RESULT
WHERE RESULT.airport = "BEIJING"