指定的字段可以引用FROM子句中列出的多个表

Question

这个错误加剧了我。我知道这是小事，但不能纠正它。

SELECT
    tblPlayerStatistics.Player_ID_Number,
    SUM(tblPlayerStatistics.TwoPointerMade + tblPlayerStatistics.ThreePointerMade) AS points, 
    MatchID
FROM
    tblPlayerStatistics
    INNER JOIN tblGameResults ON tblPlayerStatistics.MatchID = tblGameResults.MatchID
GROUP BY
    tblPlayerStatistics.Player_ID_Number,
    tblPlayerStatistics.MatchID;

Answer 1

根据我从您的问题中所理解的，您在from子句中指定的多个表中存在相同列的问题 在这种情况下，您必须在查询中指定具有表名的列 或者，将表作为别名指定您的列，并为该表指定别名 在当前查询中进行更正。

SELECT
   tblPlayerStatistics.Player_ID_Number,
   SUM(tblPlayerStatistics.TwoPointerMade + tblPlayerStatistics.ThreePointerMade) AS points, 
   tblPlayerStatistics.MatchID
FROM
   tblPlayerStatistics
   INNER JOIN tblGameResults ON tblPlayerStatistics.MatchID = tblGameResults.MatchID
GROUP BY
   tblPlayerStatistics.Player_ID_Number,
   tblPlayerStatistics.MatchID;  

您的MatchID含糊不清，请指定您使用此列的表的表名。

您可以为表指定别名，并使用该别名来访问该表的列。
使用别名：

SELECT
   ps.Player_ID_Number,
   SUM(ps.TwoPointerMade + ps.ThreePointerMade) AS points, 
   ps.MatchID
FROM
   tblPlayerStatistics ps
   INNER JOIN tblGameResults gr ON ps.MatchID = gr.MatchID
GROUP BY
   ps.Player_ID_Number,
   ps.MatchID;