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Oracle STDDEV function

14 July 2020

Oracle STDDEV function

The Oracle/PLSQL STDDEV function returns the standard deviation of the number list. The STDDEV function can be used in two ways – as an aggregate function or as an analytical function.

Syntax #1 of the STDDEV function is used as an aggregate function

Syntax for STDDEV function when used as an aggregate function:

stddev( [ DISTINCT | ALL ] expression_id )

The STDDEV function returns a numeric value.

where:

  • expression_id – is a numeric value or formula.

You can use the STDDEV function in the following versions of Oracle/PLSQL:

Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i

Example (as an aggregate function)

Let’s look at an example of Oracle STDDEV functions to understand how to use the STDDEV function in Oracle/PLSQL.

For example:

select STDDEV(bonus_id)
from empls;

The SQL query will return the standard deviation of the bonus field in the employees table.

STDDEV function syntax number 2 – use as an analytical function

Syntax for the STDDEV function when used as an analytical function:

STDDEV( [ DISTINCT | ALL ] expression_id ) [ OVER ( analytical_clause_id ) ]

You can use the STDDEV function in the following versions of Oracle/PLSQL:

Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i, Oracle 8i

Example (as an analytic function)

select empl_name,
bonus_id,
STDDEV(bonus_id) OVER (ORDER BY salary_id)
from empls
where department = 'Marketing';

The SQL query above will return the total standard deviation bonus_id in department = ‘Marketing’ in the employees table, sorted by salary_id.

STDDEV, VARIANCE(),COUNT() Functions

 
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