MySQL排球榜 [英] MySQL Volleyball Standings

问题描述

我有一个充满游戏结果的数据库表，想知道我是否可以计算以下内容:

I have a database table full of game by game results and want to know if I can calculate the following:

• GP(玩过的游戏)
• 胜利
• 损失
• 积分(每次胜利2积分，每次失败1积分)

这是我的表结构:

CREATE TABLE `results` (
  `id` int(10) unsigned NOT NULL auto_increment,
  `home_team_id` int(10) unsigned NOT NULL,
  `home_score` int(3) unsigned NOT NULL,
  `visit_team_id` int(10) unsigned NOT NULL,
  `visit_score` int(3) unsigned NOT NULL,
  `tcl_id` int(3) unsigned NOT NULL,
  PRIMARY KEY  (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=7 ;

以及一些测试结果:

INSERT INTO `results` VALUES(1, 1, 21, 2, 25, 68);
INSERT INTO `results` VALUES(2, 3, 21, 4, 17, 68);
INSERT INTO `results` VALUES(3, 1, 25, 3, 9, 68);
INSERT INTO `results` VALUES(4, 2, 7, 4, 22, 68);
INSERT INTO `results` VALUES(5, 1, 19, 4, 20, 68);
INSERT INTO `results` VALUES(6, 2, 24, 3, 26, 68);

这就是决赛桌的样子(结果并不完全准确):

Here is what a final table would look something like this (results are not completely accurate):

+-------------------+----+------+-------+--------+
| Team Name         | GP | Wins | Loses | Points |
+-------------------+----+------+-------+--------+
| Spikers           |  4 |    4 |     0 |      8 |
| Leapers           |  4 |    2 |     2 |      6 |
| Ground Control    |  4 |    1 |     3 |      5 |
| Touch Guys        |  4 |    0 |     4 |      4 |
+-------------------+----+------+-------+--------+

需要为

tcl_id

添加WHERE子句，如下所示:

like so:

结果在哪里.tcl_id= 68

WHERE results.tcl_id = 68

谢谢.

推荐答案

这应该做您想要的:

SELECT
    team_id,
    COUNT(*) AS GP,
    SUM(is_win) AS Wins,
    SUM(NOT is_win) AS Losses,
    2 * SUM(is_win) + SUM(NOT is_win) AS Points
FROM
(
    SELECT
        home_team_id AS team_id,
        home_score > visit_score AS is_win
    FROM results
    WHERE tcl_id = 68
    UNION ALL
    SELECT
        visit_team_id AS team_id,
        home_score < visit_score AS is_win
    FROM results
    WHERE tcl_id = 68
) T1
GROUP BY team_id
ORDER BY Points DESC

示例数据的输出:

4, 3, 2, 1, 5
3, 3, 2, 1, 5
1, 3, 1, 2, 4
2, 3, 1, 2, 4

注意:

• 您的示例数据似乎与您的预期输出不匹配-测试数据仅玩了6场比赛，但您的预期输出却有8场比赛.这就是为什么我的输出与您的输出不同的原因.
• 您尚未提供用于从团队ID中获取团队名称的表格.只需将表与团队名称一起加入即可以所需的格式获得结果.

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