PostgreSQL: How to calculate RANK in a query (DENSE_RANK())

In the PostgreSQL, You can also calculate RANK of a query using available windows functions.
Like SQL Server, PostgreSQL also provides functions like: RANK(), DENSE_RANK().

I am sharing one demonstration on calculating RANK of students bases on their marks. I require top 3 students result where more than one student has same marks.

Create a table with sample data:

Using DENSE_RANK(), Calculate RANK of students:

The Result:

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