Question

我试图为我正在制作的游戏阶梯编写此声明。所有内部联接都有效，直到我将团队名称添加到等式中。

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，其中包含列tblTeamName。也许我只是看不到错误???

Answer 1

您已将tblTeam别名A和B，因此，不要使用tblTeam.TeamName，而是使用A.TeamName或B.TeamName。要求。

Answer 2

您在表tblTeamName和tblTeam中有SELECT列TeamName

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

需要为同一列提供两次别名

Answer 3

那么为什么要写行

tblTeam.TeamName As AttackingTeamName,

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

MySQL INNER JOIN无法正常工作

3 个答案: