# 178. Rank Scores

### 題目敘述

SQL Schema >

``````Create table If Not Exists Scores (id int, score DECIMAL(3,2))
Truncate table Scores
insert into Scores (id, score) values ('1', '3.5')
insert into Scores (id, score) values ('2', '3.65')
insert into Scores (id, score) values ('3', '4.0')
insert into Scores (id, score) values ('4', '3.85')
insert into Scores (id, score) values ('5', '4.0')
insert into Scores (id, score) values ('6', '3.65')
``````

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.

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    |
+-------+------+
``````

#### 題目翻譯

1. 分數由高到低排序
2. 同分則同排名
3. 排名的順序是連續的整數，所以不能有缺號

### 解法解析

`DENSE_RANK``RANK` 的差異可以參考此篇文章

#### 解法範例

##### MySQL
``````# Write your MySQL query statement below
SELECT
score,
DENSE_RANK() OVER(
ORDER BY
score DESC
) AS 'rank'
FROM
Scores
ORDER BY
'rank'
``````