SQL条件

Question

に基づいて、カラムから最頻値を取得します。このクエリ

SELECT 
PlayerID, HeroTypeID, HeroTypeIDCount, Wins/(Losses + Wins) AS WinRate, Wins, Losses 
FROM (
    SELECT E.PlayerID AS PlayerID, 
      FK_HeroTypeID AS HeroTypeID, 
      COUNT(FK_HeroTypeID) AS HeroTypeIDCount, 
      SUM(CASE WHEN D.Result = 'LOSS' THEN 1 ELSE 0 END) AS Losses, 
      SUM(CASE WHEN D.Result = 'WIN' THEN 1 ELSE 0 END) AS Wins 
     FROM GamePlayerDetail D 
     JOIN Player E 
      ON D.FK_PlayerID = E.PlayerID 
     JOIN Game I 
       ON D.FK_GameID = I.GameID 
     WHERE PlayedDate BETWEEN DATE_SUB(CURDATE(), INTERVAL 7 DAY) AND CURDATE() 
    GROUP BY E.PlayerID, FK_HeroTypeID 
) AS T 
ORDER BY PlayerID 

は、次の結果生成します。私がやりたいのは何

# PlayerID, HeroTypeID, HeroTypeIDCount, WinRate, Wins, Losses 
'1', '11', '1', '1.0000', '1', '0' 
'1', '13', '3', '0.3333', '1', '2' 
'1', '24', '5', '0.8000', '4', '1' 
'1', '27', '1', '1.0000', '1', '0' 
'2', '28', '1', '0.0000', '0', '1' 
'2', '6', '1', '0.0000', '0', '1' 
'2', '30', '1', '0.0000', '0', '1' 
'2', '7', '1', '1.0000', '1', '0' 

を（最も頻繁FK_HeroTypeIDを取得していますこれはまた、PlayerIDごとにHeroTypeIDCountの最高値ですが、ネクタイの場合は、最高の勝利が優先されます。ここに私が得たいものの例があります：

PlayerID, HeroTypeID, HeroTypeIDCount, WinRate, Wins, Losses 
     1,   24,    5, 0.8000, 4,  1 
     2,   7,    1, 1.0000, 1,  0 

あなたはどのようにこのようなクエリを書くべきですか？

編集：

[OK]を、ここで生成される結果のための簡単な作成/挿入テーブルです。

http://sqlfiddle.com/#!9/d644a

Answer 1

SELECT playerid 
    , herotypeid 
    , herotypeidcount 
    , winrate 
    , wins 
    , losses 
    FROM 
    (SELECT * 
      , CASE WHEN @prev=playerid THEN @i:=@i+1 ELSE @i:=1 END rank 
      , @prev:=playerid prev 
     FROM table1 
      , (SELECT @prev:=null,@i:=0) vars 
     ORDER 
      BY herotypeidcount DESC 
      , winrate DESC 
    ) x 
WHERE rank = 1; 

ここにハック "ソリューションです。それは動作しますが、本当に頼りにすべきではありません。

SELECT * 
    FROM 
     (SELECT * 
      FROM table1 
     ORDER 
      BY herotypeidcount DESC 
      , winrate DESC 
    ) x 
    GROUP 
    BY playerid