Mysql 如何查询:A列为每个B列值按A列分组
此时,我有以下行值: 使用以下内容构建此表:Mysql 如何查询:A列为每个B列值按A列分组,mysql,sql,innodb,Mysql,Sql,Innodb,此时,我有以下行值: 使用以下内容构建此表: CREATE TABLE `registros` ( `id_registro` int(11) NOT NULL, `id_partida` int(11) NOT NULL, `id_juego` int(11) NOT NULL, `id_jugador` int(11) NOT NULL, `score` float NOT NULL DEFAULT '0', `fecha_creacion` timestamp N
CREATE TABLE `registros` (
`id_registro` int(11) NOT NULL,
`id_partida` int(11) NOT NULL,
`id_juego` int(11) NOT NULL,
`id_jugador` int(11) NOT NULL,
`score` float NOT NULL DEFAULT '0',
`fecha_creacion` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
INSERT INTO `registros` (`id_registro`, `id_partida`, `id_juego`, `id_jugador`, `score`, `fecha_creacion`) VALUES
(1, 2, 2, 1, 300, '2017-02-27 22:14:50'),
(2, 2, 2, 2, 350, '2017-02-27 22:14:50'),
(3, 2, 2, 3, 365, '2017-02-27 22:14:50'),
(4, 2, 2, 4, 110, '2017-02-27 22:14:50'),
(5, 2, 2, 5, 90, '2017-02-27 22:14:50'),
(6, 2, 2, 6, 840, '2017-02-27 22:15:11'),
(7, 2, 2, 7, 500, '2017-02-27 22:15:11'),
(8, 2, 2, 1, 20, '2017-02-27 22:15:45'),
(9, 2, 2, 1, 610, '2017-02-27 22:15:45'),
(10, 2, 2, 2, 415, '2017-02-27 22:16:07'),
(11, 2, 2, 4, 220, '2017-02-27 22:16:07'),
(13, 3, 1, 1, -600, '2017-02-27 22:17:47'),
(14, 3, 1, 1, -550, '2017-02-27 22:17:47'),
(15, 3, 1, 2, -480, '2017-02-27 22:17:47'),
(16, 3, 1, 2, -700, '2017-02-27 22:17:47'),
(17, 3, 1, 9, -490, '2017-02-27 22:18:18'),
(21, 3, 1, 2, -700, '2017-02-27 22:18:18');
我需要通过id\u jugador
为每个id\u partida
(游戏竞争)获得一个组,其中包含他的最佳分数(一个玩家在游戏中有时会有不同的分数)
我对每一场比赛都有一个“排名”。这是我的sql代码:
SELECT registros.id_partida, registros.id_jugador,MAX(registros.score) as best_score
FROM registros
WHERE registros.id_partida = 2
GROUP BY registros.id_jugador
ORDER BY best_score DESC;
执行结果:
但是我想知道所有比赛的级别和比赛的位置。不仅对特定目标使用where子句id\u partida=2
。具体如下:
Mysql数据库在此:
谢谢大家。您可以按两列进行分组:
SELECT registros.id_partida, registros.id_jugador,MAX(registros.score) as best_score
FROM registros
GROUP BY registros.id_jugador, registros.id_partida
ORDER BY best_score DESC;
如果您希望在查询中使用排名,那么使用MySQL时查询看起来会有点复杂:
select id_partida, id_jugador, best_score, rank
FROM (
select *,
case when @p=a.id_partida THEN @o:=@o+1 ELSE @o:=1 END as rank,
@p:=a.id_partida
from (
SELECT registros.id_partida, registros.id_jugador,MAX(registros.score) as best_score
FROM registros
GROUP BY registros.id_jugador, registros.id_partida
ORDER BY registros.id_partida, best_score DESC
) a, (select @p:=0, @o:=1) s
) scores
结果:
| id_partida | id_jugador | best_score | rank |
|------------|------------|------------|------|
| 2 | 6 | 840 | 1 |
| 2 | 1 | 610 | 2 |
| 2 | 7 | 500 | 3 |
| 2 | 2 | 415 | 4 |
| 2 | 3 | 365 | 5 |
| 2 | 4 | 220 | 6 |
| 2 | 5 | 90 | 7 |
| 3 | 2 | -480 | 1 |
| 3 | 9 | -490 | 2 |
| 3 | 1 | -550 | 3 |
我觉得自己很愚蠢,因为我以前没有试过。。。多谢各位。现在我需要得到所有球员的位置栏