Rank Scores LeetCode Solution

Problem – Rank Scores LeetCode Solution

SQL Schema

Table: Scores

+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| id          | int     |
| score       | decimal |
+-------------+---------+
id is the primary key for this table.
Each row of this table contains the score of a game. Score is a floating point value with two decimal places.

Write an SQL query to rank the scores. The ranking should be calculated according to the following rules:

• The scores should be ranked from the highest to the lowest.
• If there is a tie between two scores, both should have the same ranking.
• After a tie, the next ranking number should be the next consecutive integer value. In other words, there should be no holes between ranks.

Return the result table ordered by score in descending order.

The query result format is in the following example.

Example 1:

Input: 
Scores table:
+----+-------+
| id | score |
+----+-------+
| 1  | 3.50  |
| 2  | 3.65  |
| 3  | 4.00  |
| 4  | 3.85  |
| 5  | 4.00  |
| 6  | 3.65  |
+----+-------+
Output: 
+-------+------+
| score | rank |
+-------+------+
| 4.00  | 1    |
| 4.00  | 1    |
| 3.85  | 2    |
| 3.65  | 3    |
| 3.65  | 3    |
| 3.50  | 4    |
+-------+------+

Rank Scores LeetCode Solution in MySQL

SELECT
  Score,
  @rank := @rank + (@prev <> (@prev := Score)) Rank
FROM
  Scores,
  (SELECT @rank := 0, @prev := -1) init
ORDER BY Score desc

Rank Scores LeetCode Solution in MS SQL Server

SELECT s.Score as Score,
DENSE_RANK() OVER (ORDER BY s.Score DESC) as Rank
FROM Scores s

Rank Scores LeetCode Solution in Oracle

select 
 s.score Score ,
 r.rn Rank
from 
 Scores s, 
(select s.score sc, rownum rn from 
  (select s.score from Scores s
    group by s.Score order by s.score desc) s) r
 where s.score = r.sc

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