This page is a quick reference checkpoint for AVG OVER in MariaDB: 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.
Aggregate functions such as AVG() can be used as window functions
If this behavior feels unintuitive, the tutorial below explains the underlying pattern step-by-step.
Standard aggregate function AVG() used with an OVER clause
SELECT name, test, score, AVG(score) OVER (PARTITION BY test) AS average_by_test FROM student
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 MariaDB Documentation →Looking for more functions across all SQL dialects? Visit the full SQL Dialects & Window Functions Documentation.