在 MySQL 中合并多个表以查看

Question

下面是我用来尝试从 3 个表创建视图的代码。我收到一个错误“错误代码 1052 fighterID 不明确”。这是我尝试创建的第一个视图，我无法辨别我做错了什么以正确填充视图。

CREATE VIEW championsList AS (
SELECT champions.fighterId, fighters.fighterId, weightClasses.weightClassId, fighters.firstName, fighters.LastName, weightClasses.weightClass
FROM champions, fighters
INNER JOIN fighters champions
ON
champions.fighterId = fighters.fighterId
INNER JOIN champions weightClasses
ON
champions.weightClassId=weightClasses.weightClass



fighters
1 Frank Smith 
2 Fred  Lewis

champions
1 2
2 1

weightClasses
1 heavyweight
2 bantemweight

ChampionsList
Frank Smith bantemweight
Fred Lewis Heavyweight

Answer 1

为各自表中名为 fighterId 的两列提供别名：

CREATE VIEW championsList AS (
    SELECT champions.fighterId AS c_fighterId, fighters.fighterId AS f_fighterId,
        weightClasses.weightClassId, fighters.firstName, fighters.LastName,
        weightClasses.weightClass
    FROM champions INNER JOIN fighters
        ON champions.fighterId = fighters.fighterId
    INNER JOIN weightClasses
        ON champions.weightClassId = weightClasses.weightClass
)

我还将您的查询清理为我认为您的意图。