In this post, I am sharing the use of two functions of PostgreSQL which are PERCENT_RANK() and CUME_DIST().
Using these functions, we can calculate the Percent Rank and Cumulative Percent Rank of number column.

We know about the normal RANK(), which generates the rank of the number. But sometimes, it requires checking the percentage instead of rank.

Please check the below demonstration:

Create a sample table with data:

CREATE TABLE tbl_Numbers
(ID INTEGER);

INSERT INTO tbl_Numbers 
VALUES (1),(2),(3),(4),(5);

Calculate the Percent rank and Cumulative Percent rank:

SELECT 
	ID
    ,(PERCENT_RANK() OVER win)::numeric(10, 2) as PercentRank
    ,(CUME_DIST() OVER win)::numeric(10, 2) as CumulativeRank
FROM tbl_Numbers 
WINDOW win AS (ORDER BY ID);

The Result: