[MySQL习题] 得分排名 Rank Scores

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

（1）对于每一个分数，找出大于等于该分数的不同分数作为Rank； （2）降序排列。

实现代码

select a.Score, (select count(distinct Score) from Scores where Score >= a.Score) Rank # distinct Score, 不是distinct Id from Scores a order by a.Score desc;