LeetCode: 178. Rank Scores

题目描述

Write a SQL query to rank scores. If there is a tie between two scores, both should have the same ranking. Note that after a tie, the next ranking number should be the next consecutive integer value. In other words, there should be no “holes” between ranks.

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

For example, given the above Scores table, your query should generate the following report (order by highest score):

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

解题思路

Rank 实际上就是比当前值到的数的个数 + 1。

AC 代码

SELECT Score, (SELECT count(DISTINCT Score) FROM Scores WHERE Score >= s.Score) AS Rank FROM Scores AS s ORDER BY Score DESC