Question

我的查询是获取每个玩家的最高分以及该会话过去的时间。

在MySQL中使用以下查询并运行

SELECT Playername as 'Player Name', HighScores.P1Score as 'Highest Score', TimeElapsed as 'Elapsed Time'
FROM 
(gamerecord inner join playerprofile ON playerprofile.PID = gamerecord.PID),
(SELECT GID, PID, P1Score 
 FROM (SELECT GID, PID, P1Score 
       FROM gamerecord 
       ORDER BY 3 DESC) AS sortedtable 
 GROUP BY PID) AS HighScores 
WHERE gamerecord.GID = Highscores.GID

现在，使用MSSQL Server时，会引发以下错误。

ORDER BY子句在视图，内联函数，派生表，子查询和公用表表达式中无效，除非还指定了TOP，OFFSET或FOR XML。

最里面的查询用于在GROUP BY操作之前首先对结果进行排序。据观察GROUP BY占据最高值，因此通过排序，我确保最高值是最高分。

如果没有抛出该错误，我怎样才能使用MSSQL？

Answer 1

我希望查询能够使用group查找每个游戏的最高得分，然后加入其余信息：

SELECT pp.Playername , gr.P1Score as HighestScore, gr.TimeElapsed 
FROM gamerecord gr inner join
     playerprofile pp
     ON pp.PID = gr.PID inner join
     (SELECT PID, max(p1score) as maxscore
      FROM gamerecord
      GROUP BY PID
     ) grmax
     ON gr.PID = grmax.PID and gr.p1score = grmax.maxscore;

order by不适合此类查询。

SQL ORDER BY子查询

1 个答案: