Aggregate Example
The following example calculates the average salary of all employees in the
The following example calculates the average salary of all employees in the
hr.employees
table:SELECT AVG(salary) "Average" FROM employees; Average -------------- 6461.83178
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 ORDER BY manager_id, hire_date, salary; MANAGER_ID LAST_NAME HIRE_DATE SALARY C_MAVG ---------- ------------------------- --------- ---------- ---------- 100 De Haan 13-JAN-01 17000 14000 100 Raphaely 07-DEC-02 11000 11966.6667 100 Kaufling 01-MAY-03 7900 10633.3333 100 Hartstein 17-FEB-04 13000 9633.33333 100 Weiss 18-JUL-04 8000 11666.6667 100 Russell 01-OCT-04 14000 11833.3333 100 Partners 05-JAN-05 13500 13166.6667 100 Errazuriz 10-MAR-05 12000 11233.3333 . . .
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