MySql十进制问题输出

Question

晚上

我有一项运动 table，它按成功百分比排序（（获胜的游戏 +（游戏 drawn/2）/玩过的游戏），我在输出之后如果 100%游戏赢了，然后它读作 1.000、75%，然后是 .750、50% 为 .500 等（前导 0 被删除）。

目前我可以让它显示 0.000 到 0.950，如果球队只打了 1 场比赛并赢了，那么输出显示 0.100。

我怎样才能： a) 让它显示 1 场比赛 played/won 为 1.000 b) 以百分比形式显示和其他组合，例如 .500

有什么想法吗？

谢谢

SELECT team
     , COUNT(*) as played
     , SUM(win) as wins
     , SUM(loss) as lost
     , SUM(draw) as draws
     , SUM(SelfScore) as ptsfor
     , SUM(OpponentScore) as ptsagainst
     , SUM((win*2 + draw)- loss) as score
     , CAST(SUM(win + (draw/2))/(count(*)) as decimal(3,3)) pctWon
FROM (
      SELECT team
     , SelfScore
     , OpponentScore
     , SelfScore > OpponentScore win
     , SelfScore < OpponentScore loss
     , SelfScore = OpponentScore draw
      FROM (
        SELECT HomeTeam team, HomeScore SelfScore, AwayScore OpponentScore
        FROM Game
        WHERE Season = '2015' and Type = 'League'
        UNION ALL 
        SELECT AwayTeam, AwayScore, HomeScore
        FROM Game
        WHERE Season = '2015' and Type = 'League'
       ) a
) b
GROUP BY team
ORDER BY pctWon DESC, score DESC, ptsagainst DESC, team ASC;
        ");

这会产生正确的外观 table，除了前 2 个显示的 PCT 不正确。

Team    W   L   T   PF  PA  PCT
T1      1   0   0   54  0   0.100
T2      1   0   0   44  0   0.100
T3      0   1   0   0   54  0.000
T4      0   1   0   0   44  0.000
T5      6   2   2   220 122 0.700
T6      7   3   0   247 139 0.700
T7      6   4   0   191 191 0.600
T8      4   5   1   167 201 0.450
T9      3   6   1   142 202 0.350
T10     2   8   0   193 305 0.200

谢谢

Answer 1

DECIMAL(3,3) 小数点左边没有 space。你需要 DECIMAL(4,3).

您使用的 MySQL 是什么版本？ 0.100 听起来像个错误。但我无法在 5.6.12 上使用

重现它

mysql> SELECT CAST(((1+0/2)/1) AS DECIMAL(3,3));
+-----------------------------------+
| CAST(((1+0/2)/1) AS DECIMAL(3,3)) |
+-----------------------------------+
|                             0.999 |
+-----------------------------------+

请注意 (4,3) 可以满足您的需求：

mysql> SELECT CAST(((1+0/2)/1) AS DECIMAL(4,3));
+-----------------------------------+
| CAST(((1+0/2)/1) AS DECIMAL(4,3)) |
+-----------------------------------+
|                             1.000 |
+-----------------------------------+

Answer 2

我终于解决了这个问题！

问题似乎是在 CAST 中玩的游戏的计数。

而不是：

 , CAST(SUM(win + (draw/2))/(count(*)) as decimal(3,3)) pctWon

以下给出了正确的输出：

 , CAST(SUM(win + (draw/2))/SUM(win + loss + draw) as decimal(4,3)) as pctWon

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