Write a SQL query to rank scores. If there is a tie between the scores, both should has the same ranking. Note that after a tie, the next ranking number should is the next consecutive integer value. In the other words, there should is 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 Score,rank from (select Score, @curRank: = @curRank +if (@prevNum =score,0,1) as Rank, @prevNum: =score from score S, ( Select @curRank: =0) A, (select @prevNum: =null) p ORDER BY score desc) T
Use MySQL's user-defined Variables (user-defined variable).
Links to related articles reproduced.
Http://www.bitscn.com/pdb/mysql/201407/226377.html
Http://blog.csdn.net/acema/article/details/37114379?utm_source=tuicool