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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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