This page is a quick reference checkpoint for AVG OVER in ORACLE: behavior, syntax rules, edge cases, and a minimal example; plus the official vendor documentation.
AVG OVER returns the average value of an expression across the window frame.
Behavior: AVG returns the average of expr; for analytic use it respects the analytic_clause (partitioning, ordering, window frame) and for vector inputs NULLs are ignored and if all inputs NULL then result is NULL.
If this behavior feels unintuitive, the tutorial below explains the underlying pattern step-by-step.
Syntax: AVG(expr) OVER (analytic_clause). For DISTINCT: only the query_partition_clause is allowed, ORDER BY and windowing_clause are not allowed.
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;
If you came here to confirm syntax, you’re done. If you came here to get better at window functions, choose your next step.
AVG OVER is part of a bigger window-function pattern. If you want the “why”, start here: Aggregate Window Functions
Reading docs is useful. Writing the query correctly under pressure is the skill.
For the authoritative spec, use the vendor docs. This page is the fast “sanity check”.
View ORACLE Documentation →Looking for more functions across all SQL dialects? Visit the full SQL Dialects & Window Functions Documentation.