Question

我正试图从我所拥有的比赛表中获得排名列表。 matches表中的每一行代表一个已经播放的匹配，包括赢家和输家。排名应基于特定玩家累积的胜利数量。我目前有一个基于胜利对玩家进行排名的查询，但不包括0胜的玩家。

如何调整查询以便结果中包含0胜的玩家？我是否可以将损失考虑在内，以便0胜的玩家根据损失数排名？

所有相关信息如下。谢谢。

matches表：

winner   |   loser   |    winner_score   |   loser_score
--------------------------------------------------------
Jason    |   Alex    |         15        |       13
Bill     |   Jason   |         14        |       11
Alex     |   Bill    |         12        |        6
Jason    |   Scott   |         13        |        8

我当前的查询：

SELECT t1.player, 
   (SELECT Count(*) 
    FROM   (SELECT Count(*) AS wins, 
                   winner   AS player 
            FROM   matches 
            GROUP  BY winner 
            ORDER  BY wins DESC) t2 
    WHERE  t2.wins > t1.wins) 
   + 1 AS rank, 
   t1.wins 
FROM   (SELECT Count(*) AS wins, 
           winner   AS player 
    FROM   matches 
    GROUP  BY winner 
    ORDER  BY wins DESC) t1

我目前的结果：

player   |   rank  |    wins
------------------------------
Jason    |    1    |     2
Bill     |    2    |     1
Alex     |    2    |     1

我想要的结果：

player   |   rank  |    wins   |   losses
---------------------------------------------
Jason    |    1    |     2     |     1
Bill     |    2    |     1     |     1
Alex     |    2    |     1     |     1
Scott    |    3    |     0     |     1

Answer 1

看起来很复杂，但实际上并非如此：）

看到它在sqlfiddle

select player, wins, losses, rank from (

    select ssq.*, 
    @rank := if(@prev_win = wins, @rank, @rank + 1) as rank,
    @prev_win := wins
    from (

        select
        player,
        sum(won=1) as wins,
        sum(won=0) as losses
        from (

            select
            winner as player,
            1 as won
            from
            Table1
            union all
            select
            loser as player,
            0 as won
            from 
            Table1

        ) sq
        group by player

    ) ssq
    , (select @rank := 0, @prev_win := null) var_init
    order by wins desc, wins-losses asc

) sssq

调整MySQL排名查询

1 个答案: