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Returns the maximum value within the requested window. For more information on usage, please refer to Window Functions.

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Syntax

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

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Parameters

ParameterDescriptionSupported input types
<expression>A value used for the MAX functionAny
<partition_by>An expression used for the PARTITION BY clause.Any

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Return Types

Same as input type

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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:
nicknamelevelcurrent_scorehighest_score
kennethpark97695
sabrina2179098
burchdenise57999
ymatthews68593
rileyjon88084
⌘I