how to use CORR Function in oracle sql

The CORR Function in Oracle SQL / PLSQL is used to calculate the coefficient of correlation in a set of numbers.

Syntax for the using the CORR Function in Oracle SQL / PLSQL is:

SELECT CORR(n,m)[OVER analytic_clause]
FROM table_name;

• n and m are numbers used to calculate the coefficient of correlation.
• The CORR function in Oracle SQL / PLSQL requires at least 2 records or rows in a table.

Example:

Using CORR Function in Oracle SQL / PLSQL SELECT statement:

Suppose we have a table named ‘employee’ as shown below:

Employee_ID	Employee_Name	Salary	Department	Commission
101	Emp A	10000	Sales
102	Emp B	20000	IT	20
103	Emp C	28000	IT	20
104	Emp D	30000	Support
105	Emp E	32000	Sales	10
106	Emp F	40000	Sales	10
107	Emp G	12000	Sales	10
108	Emp H	12000	Support

If we write our CORR Function query as:

SELECT CORR(salary, commission)
FROM employee;

We will get ‘-0.174844651545059’ as output.