MySQL实现分数排名问题

数据库记录

mysql> select * from scores;
+----+-------+
| Id | Score |
+----+-------+
|  1 | 3.50  |
|  2 | 3.65  |
|  3 | 4.00  |
|  4 | 3.85  |
|  5 | 4.00  |
|  6 | 3.65  |
+----+-------+

分数排名问题

SELECT s.score, (
  select count(distinct si.Score) from scores si where si.score >= s.Score
) as 'Rank'
FROM `scores` s
order by s.score desc

查询结果

+-------+------+
| score | Rank |
+-------+------+
| 4.00  |    1 |
| 4.00  |    1 |
| 3.85  |    2 |
| 3.65  |    3 |
| 3.65  |    3 |
| 3.50  |    4 |
+-------+------+

建表语句

CREATE TABLE `scores` (
  `Id` bigint(18) NOT NULL AUTO_INCREMENT,
  `Score` decimal(10,2) DEFAULT NULL,
  PRIMARY KEY (`Id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;

INSERT INTO `scores` VALUES (1, 3.50);
INSERT INTO `scores` VALUES (2, 3.65);
INSERT INTO `scores` VALUES (3, 4.00);
INSERT INTO `scores` VALUES (4, 3.85);
INSERT INTO `scores` VALUES (5, 4.00);
INSERT INTO `scores` VALUES (6, 3.65);