如何修改這個mysql查詢來顯示勝率？

Question

下面這個查詢：

SELECT member, count(*) Wins 
FROM (SELECT player2_name as member from results 
WHERE player1_id = 2 AND player1_result = 'W' AND community_id = 16 
UNION ALL SELECT player1_name FROM results WHERE player2_id = 2 
AND player2_result = 'W' AND community_id = 16) AS T 
group by member ORDER BY Wins DESC 

產生的結果，如：

+---------+-----------+ 
| member | Wins | 
+---------+-----------+ 
| Player 1|  4  | 
| Player 2|  3  | 
| Player 3|  3  | 
+---------+-------------+ 

爲了使數據更加有用（如每個玩家可能都起到了不同數量的遊戲）我想說明的額外的列'勝利百分比'。

- >這是基於每個玩家玩過/贏的遊戲數量。 - 如果輸出％是不可能直接在MySQL則小數就可以了，即0.76

我如何修改我現有的查詢產生如下的輸出：

+---------+-----------+---------------+---------+ | member | Wins | Games Played | Win % | +---------+-----------+---------------+---------+ | Player 1| 4 | 8 | 0.50 | | Player 2| 3 | 3 | 1.00 | | Player 3| 3 | 5 | 0.60 | +---------+-----------+---------------+---------+

我希望只是在添加一些東西沿着線：

SELECT GamesPlayed FROM (SELECT player1_name as member from results 
WHERE player1_id = 2 AND community_id = 16 
UNION ALL SELECT player2_name FROM results WHERE player2_id = 2 
AND community_id = 16) AS GP 

，然後在1號線：

SELECT member, count(*) Wins, round(sum(wins/GamesPlayed(1),2) WinPercentage 

但是，這是一個非常粗糙的希望我猜怎麼看它的工作。

最新的測試數據：

Answer 1

像這樣的事情？

更新查詢

SELECT 
    T.member 
    , count(*) Wins 
    , total.gamesPlayed 
    , count(*)/total.gamesPlayed as winPercentage 
FROM 
    (
     SELECT 
      player2_name as member 
     from results 
     WHERE 
      player1_id = 2 
      AND player1_result = 'W' 
      AND community_id = 16 
     UNION ALL 
     SELECT 
      player1_name 
     FROM results 
      WHERE player2_id = 2 
      AND player2_result = 'W' 
      AND community_id = 16 
    ) AS T 
    , (
      select 
       u.member 
       , sum(u.gamesPlayed) as gamesPlayed 
      from 
       (
        select 
         player2_name as member 
         , count(*) gamesPlayed 
        from results 
        where 
         player1_id = 2 
         AND community_id = 16 
        group by player2_name 
        union 
        select 
         player1_name as member 
         , count(*) gamesPlayed 
        from results 
        where 
         player2_id = 2 
         AND community_id = 16 
        group by player2_name 
       ) as u /* union of two */ 
      group by member 
    ) as total 
where 
    T.member = total.member 
group by T.member 
ORDER BY Wins DESC