在mysql数据库中 rank的用法
【计算机英语】 2016-03-20本文已影响
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在mysql数据库中 rank的用法的用法你知道吗?下面小编就跟你们详细介绍下在mysql数据库中 rank的用法的用法,希望对你们有用。
在mysql数据库中 rank的用法的用法如下:
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.
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+----+-------+
| 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):
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+-------+------+
| Score | Rank |
+-------+------+
| 4.00 ?| 1 ? ?|
| 4.00 ?| 1 ? ?|
| 3.85 ?| 2 ? ?|
| 3.65 ?| 3 ? ?|
| 3.65 ?| 3 ? ?|
| 3.50 ?| 4 ? ?|
+-------+------+
题目解答:
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# Write your MySQL query statement below
SELECT Scores.Score, COUNT(Ranking.Score) AS RANK
FROM Scores
, (
SELECT DISTINCT Score
FROM Scores
) Ranking
WHERE Scores.Score <= Ranking.Score
GROUP BY Scores.Id, Scores.Score
ORDER BY Scores.Score DESC;
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