This page is a quick reference checkpoint for AVG OVER in Snowflake: 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.
When used as a window function with ORDER BY: if no window frame is specified, the implied frame is RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW; VARCHAR inputs are implicitly cast to float and will error if cast fails.
If this behavior feels unintuitive, the tutorial below explains the underlying pattern step-by-step.
AVG( [ DISTINCT ] <expr1> ) OVER ( [ PARTITION BY <expr2> ] [ ORDER BY <expr3> [ ASC | DESC ] [ <window_frame> ] ] )
SELECT region, amount, AVG(amount) OVER (PARTITION BY region ORDER BY amount) AS avg_over_region FROM sales;
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 Snowflake Documentation →Looking for more functions across all SQL dialects? Visit the full SQL Dialects & Window Functions Documentation.