Windows Function What is Rank and Desnse Rank in SQL End to End Guide
Автор: Technical Surani
Загружено: 2023-07-23
Просмотров: 42
Learn the difference between RANK and DENSE RANK in MySQL in this end-to-end guide!
In this video, we'll cover the following topics:
What are RANK and DENSE RANK?
How do they work?
When should you use each one?
Examples of how to use RANK and DENSE RANK in MySQL
The RANK and DENSE_RANK functions are both used to assign ranks to rows in a result set. However, there is one key difference between the two functions: RANK skips ranks when there are ties, while DENSE_RANK does not.
SELECT
name,
score,
RANK() OVER (ORDER BY score DESC) AS rank,
DENSE_RANK() OVER (ORDER BY score DESC) AS dense_rank
FROM students;
----
name score rank dense_rank
Alice 100 1 1
Bob 90 2 2
Carol 90 2 3
Dave 80 4 4
----
As you can see, the RANK function assigns the rank of 2 to both Bob and Carol, even though they have the same score. This is because RANK skips ranks when there are ties. The DENSE_RANK function, on the other hand, does not skip ranks. This means that Carol is assigned the rank of 3, even though she has the same score as Bob.
In general, you should use RANK when you want to skip ranks when there are ties. You should use DENSE_RANK when you want to assign consecutive ranks, even when there are ties.
Here are some additional examples of how RANK and DENSE_RANK can be used:
You could use RANK to determine the top 10 students in a class.
You could use DENSE_RANK to determine the overall ranking of a group of athletes, even if some of the athletes have the same score.
You could use RANK to determine the position of a product in a search results page.
You could use DENSE_RANK to determine the position of a product in a list of products that are sorted by price.
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