标签：排名 mysq 处理 join blog rank sch 常见 weight
参考： https://my.oschina.net/Tsybius2014/blog/493244
常见的排序1. 排名1,2,3，...，n 不对重复的分数做特殊处理
Score Rank
100 1
99 2
99 3
98 4
90 5
# Write your MySQL query statement below select Score, @Counter := @Counter + 1 as rank from Scores, (select @Counter := 0) as C order by Score desc;
排序2. 相同分数排名相同，排名第n名表示前面有n-1个人，而不是n-1个分数。
Score Rank
100 1
99 2
99 2
98 4
90 5
# Write your MySQL query statement below select S1.Score, ( select count(Score) + 1 from Scores S2 where S1.Score < S2.Score ) as Rank from Scores S1 order by Score desc
排序3. 相同分数排名相同，第n名表示前面有n-1个分数。
Score Rank
100 1
99 2
99 2
98 3
90 4
# Write your MySQL query statement below select s.Score, count(distinct t.Score) Rank from Scores s join Scores t on s.Score <= t.Score #join 和 inner join是 group by s.Id order by s.Score desc;
Leetcode 178. Rank Scores (Database)
标签：排名 mysq 处理 join blog rank sch 常见 weight
原文地址：http://www.cnblogs.com/lettuan/p/6336412.html
