mysql - MySQL INNER JOIN 不起作用

Question

我试图为我正在制作的游戏阶梯写这个声明。在我将团队名称添加到方程式之前，所有内部连接都有效。

SELECT tblMatch.AttackingTeam,
       tblMatch.DefendingTeam,
       tblTeam.TeamName As AttackingTeamName,
       tblTeam.TeamName As DefendingTeamName,
       tblGameMaps.MapName AS MapName,
       tblGameTypes.TypeShort AS TypeName,
       tblStyles.StyleShort AS StyleName,
       tblMatch.AttackingScore,
       tblMatch.DefendingScore
FROM tblMatch
INNER JOIN tblGameMaps
ON tblGameMaps.MapID = tblMatch.MapID
INNER JOIN tblGameTypes
ON tblGameTypes.TypeID = tblMatch.TypeID
INNER JOIN tblStyles
ON tblStyles.StyleID = tblMatch.StyleID
INNER JOIN tblTeam A
ON A.TeamID = tblMatch.AttackingTeam
INNER JOIN tblTeam B
ON B.TeamID = tblMatch.DefendingTeam
WHERE LadderID=$ladderID AND (DefendingTeam=$teamID OR AttackingTeam=$teamID)

我得到的错误是

“字段列表”中的未知列“tblTeam.TeamName”

数据库确实有一个名为 tblTeam 的表，其中有一列 tblTeamName。也许我只是看不到错误？？？

Answer 1

您已经使用tblTeam了Aand的别名B，因此不要使用tblTeam.TeamNameuse 或者A.TeamName根据B.TeamName您的要求。

Answer 2

tblTeamName您在表格中有一个列，tblTeam并且SELECT您正在调用TeamName

   tblTeam.TeamName As AttackingTeamName,
   tblTeam.TeamName As DefendingTeamName,

以及需要给同一列两次别名

Answer 3

那为什么要写这行

tblTeam.TeamName As AttackingTeamName,

也许这就是问题所在（CTRL-F 然后输入“tblTeam.TeamName As AttackingTeamName”）