mysql - SQL 用于根据评分获取顶级用户并使用结果获取其他数据

Question

我正试图想出一个 SQL 来获取每一个

• 国家名称，
• 代码，
• 游戏数量，
• TOP 玩家的名字和
• 他的身份证
• 基于游戏表中的 SUM(评分)。

我无法根据评分获取顶级玩家的名字。

SQLFiddle Demo

Answer 1

SELECT  x.Country AS CountryName,
        x.Code,
        a.totalCount as NumberOfGames,
        y.Name AS PlayersName,
        y.ID AS PlayersID,
        a.totalRating
FROM    (
            SELECT  player_ID, Country, COUNT(*) totalCount, SUM(Rating) totalRating
            FROM    Games
            GROUP BY player_ID, Country
        ) a 
        INNER JOIN
        (
            SELECT Country, Max(totaLRating) maxRating
            FROM
            (
                SELECT  player_ID, Country, SUM(Rating) totalRating
                FROM    Games
                GROUP BY player_ID, Country
            ) s
            GROUP BY Country
        ) b ON a.Country = b.Country AND
                a.totalRating = b.maxRating
        INNER JOIN Country x
            ON a.Country = x.ID
        INNER JOIN Players y
            ON a.player_ID = y.ID

• SQLFiddle Demo