Rank Scores

标签：.com   select   core   example   rom   bubuko   sel   val   sele   

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    |
+-------+------+

select distinct Score from Scores order by Score desc;

select 
　　tmps.Score,(@rank := @rank + 1) as Rank  
from (
　　select 
　　　　distinct Score 
　　from Scores 
　　order by Score desc
) tmps,(select @rank :=0) ind;

select 
　　lef.Score as Score,rig.Rank as Rank 
from Scores lef 
　　　　left join 
　　　(select 
　　　　　　tmps.Score ,(@rank := @rank + 1) as Rank  
　　　　from (select 
　　　　　　　　　　distinct Score 
　　　　　　　　from Scores order by Score desc) tmps,
　　　　　　　(select @rank :=0) ind
　　　　) rig 
　　　　on lef.Score=rig.Score order by Score desc;

Rank Scores

标签：.com   select   core   example   rom   bubuko   sel   val   sele   

原文地址：https://www.cnblogs.com/kaibing/p/9164714.html