MAX OVER

Returns the maximum value within the requested window.

For more information on usage, please refer to Window Functions.

Syntax

MAX( <expression> ) OVER ( [ PARTITION BY <partition_by> ] )

Parameters

Parameter	Description	Supported input types
<expression>	A value used for the MAX function	Any
<partition_by>	An expression used for the PARTITION BY clause.	Any

Return Types

Same as input type

Example

The example below queries test scores for players in various grade levels. Unlike a regular MAX() aggregation, the window function highlights how each player individually compares to the highest game score for their level.

SELECT
	nickname,
	level,
	current_score,
	MAX(current_score) OVER (PARTITION BY level) AS highest_score
FROM
	players;

Returns:

nickname	level	current_score	highest_score
kennethpark	9	76	95
sabrina21	7	90	98
burchdenise	5	79	99
ymatthews	6	85	93
rileyjon	8	80	84