MySQL Volley 排名

Question

我有一个按游戏结果填满游戏的数据库表，想知道我是否可以计算以下内容:

• GP(玩过的游戏)
• 获胜
• 失败
• 积分(每胜2分，每负1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);

决赛 table 看起来像这样(结果并不完全准确):

+-------------------+----+------+-------+--------+
| 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

添加 WHERE 子句

tcl_id

像这样:

WHERE results.tcl_id = 68

提前谢谢你。

Answer 1

这应该做你想做的:

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

注意事项:

• 您的示例数据似乎与您的预期输出不匹配 - 您的测试数据只有 6 场比赛，但您的预期输出有 8 场比赛。这就是为什么我的输出与您的不同。
• 您没有提供用于从团队 ID 中获取团队名称的表格。只需加入带有团队名称的表格即可获得所需格式的结果。