AVG

Syntax

Purpose

AVG returns average value of expr.

This function takes as an argument any numeric datatype or any nonnumeric datatype that can be implicitly converted to a numeric datatype. The function returns the same datatype as the numeric datatype of the argument.

If you specify DISTINCT, then you can specify only the query_partition_clause of the analytic_clause. The order_by_clause and windowing_clause are not allowed.

Aggregate Example

The following example calculates the average salary of all employees in the hr.employees table:

SELECT AVG(salary) "Average" FROM employees;
 Average
--------
 6425

Analytic Example

The following example calculates, for each employee in the employees table, the average salary of the employees reporting to the same manager who were hired in the range just before through just after the employee:

SELECT manager_id, last_name, hire_date, salary,
 AVG(salary) OVER (PARTITION BY manager_id ORDER BY hire_date 
 ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING) AS c_mavg
 FROM employees;
MANAGER_ID LAST_NAME HIRE_DATE SALARY C_MAVG
---------- ------------------------- --------- ---------- ----------
 100 Kochhar 21-SEP-89 17000 17000
 100 De Haan 13-JAN-93 17000 15000
 100 Raphaely 07-DEC-94 11000 11966.6667
 100 Kaufling 01-MAY-95 7900 10633.3333
 100 Hartstein 17-FEB-96 13000 9633.33333
 100 Weiss 18-JUL-96 8000 11666.6667
 100 Russell 01-OCT-96 14000 11833.3333
. . .