syntax and example of VAR_POP Function in oracle database query

The VAR_POP Function in Oracle SQL / PLSQL is used to calculate the population variance of a set of numbers.

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

SELECT VAR_POP(expression_1)
FROM table_name;

• expression_1 is a numeric expression
• The VAR_POP function in Oracle SQL / PLSQL will eliminate all NULL values before calculation.

Examples:

Using VAR_POP 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 VAR_POP Function query as:

SELECT VAR_POP(salary)
FROM employee;

We will get ‘66750000’ as output