按显示的行递增的整数答案

【问题标题】：Integer incremented by line displayed按显示的行递增的整数
【发布时间】：2023-01-10 19:09:47
【问题描述】：

这是团队表：



+----+-------+--------+-------+
| id | alias | pwd    | score |
+----+-------+--------+-------+
|  1 | login | mdp    |     5 |
|  2 | azert | qsdfgh |    50 |
|  3 | test  | test   |   780 |
+----+-------+--------+-------+

这是活动表

+----+--------------+---------------------+-------+--------+
| id | localisation | name                | point | answer |
+----+--------------+---------------------+-------+--------+
|  1 | Madras       | Lancement du projet |     0 | NULL   |
|  2 | Valparaiso   | act1                |   450 | un     |
|  3 | Amphi        | act2                |    45 | deux   |
|  4 | Amphix       | act3                |   453 | trois  |
|  5 | Amphix       | act4                | 45553 | qautre |
|  6 | Madras       | Lancement du projet |     0 | NULL   |
|  7 | Valparaiso   | act1                |   450 | un     |
|  8 | Amphi        | act2                |    45 | deux   |
|  9 | Amphix       | act3                |   453 | trois  |
| 10 | Amphix       | act4                | 40053 | fin    |
+----+--------------+---------------------+-------+--------+

这是饲料表：

+--------+---------------------+------------+--------+
| FeedId | ts                  | ActivityId | TeamId |
+--------+---------------------+------------+--------+
|      1 | 2023-01-10 00:02:06 |          1 |      3 |
|      2 | 2023-01-10 00:02:28 |          2 |      3 |
|      3 | 2023-01-10 00:21:13 |          3 |      3 |
|      4 | 2023-01-10 00:24:49 |          3 |      3 |
|      5 | 2023-01-10 00:30:58 |          1 |      1 |
+--------+---------------------+------------+--------+

我做了这个

MariaDB [sae]> SELECT @rownum:=@rownum+1 as 'Classement', t.alias, SUM(a.point) as total_points FROM activity a INNER JOIN feed f ON a.id = f.ActivityId INNER JOIN team t ON f.TeamId = t.id JOIN (SELECT @rownum:=0) r GROUP BY t.alias ORDER BY total_points DESC, Classement DESC;
+------------+-------+--------------+
| Classement | alias | total_points |
+------------+-------+--------------+
|          2 | test  |          540 |
|          1 | login |            0 |
+------------+-------+--------------+

这里得分最高的球队包含排名 2 而不是 1，如果我按 ASC 排名排序，它不会改变任何东西。

我希望这样：

+------------+-------+--------------+
| Classement | alias | total_points |
+------------+-------+--------------+
|          1 | test  |          540 |
|          2 | login |            0 |
+------------+-------+--------------+

你知道如何增加这个“向后”整数吗？

【问题讨论】：

尝试不使用 ORDER BY Classement DESC
你用的是什么版本的mariadb

标签： mysql sql mariadb

【解决方案1】：

使用与您相同的逻辑，您可以按如下方式进行：

select @rownum:=@rownum+1 as 'Classement', s.*
from (
    SELECT t.alias, SUM(a.point) as total_points 
    FROM activity a 
    INNER JOIN feed f ON a.id = f.ActivityId 
    INNER JOIN team t ON f.TeamId = t.id 
    JOIN (SELECT @rownum:=0) r 
    GROUP BY t.alias 
    ORDER BY total_points DESC
) as s;

在这里查看：https://dbfiddle.uk/TEz3UT97

它在 mysql 和 mariadb 上工作

【讨论】：