SQL Server实现 LeetCode 178 分数排名

时间:2020-12-10 19:56:20

178. 分数排名

SQL架构

编写一个 SQL 查询来实现分数排名。如果两个分数相同,则两个分数排名(Rank)相同。请注意,平分后的下一个名次应该是下一个连续的整数值。换句话说,名次之间不应该有“间隔”。

+----+-------+
| Id | Score |
+----+-------+
| 1 | 3.50 |
| 2 | 3.65 |
| 3 | 4.00 |
| 4 | 3.85 |
| 5 | 4.00 |
| 6 | 3.65 |
+----+-------+

例如,根据上述给定的 Scores 表,你的查询应该返回(按分数从高到低排列):

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

PS:

b是查询的不重复的成绩,和降序的数字序列

SELECT b.Score AS Score,b.Rank FROM Scores INNER JOIN
(
SELECT Score,ROW_NUMBER() OVER (ORDER BY Score DESC) AS Rank FROM
(SELECT DISTINCT(Score) AS Score FROM Scores)
a
)b ON b.Score = Scores.Score
ORDER BY b.Rank