Returns a unique row number for each row within the requested window.

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

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Syntax

ROW_NUMBER() OVER ([PARTITION BY <partition_by>] ORDER BY <order_by> [ASC|DESC] )

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Parameters

ParameterDescriptionSupported input types
<partition_by>The expression used for the PARTITION BY clause.Any
<order_by>The expression used in the ORDER BY clause. This parameter determines what value will be used for ROW_NUMBER.Any

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Return Type

INTEGER

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Example

In this example below, players in each game level are assigned a player ID.

SELECT
	nickname,
	level,
	ROW_NUMBER() OVER (PARTITION BY level ORDER BY level ASC ) AS player_id
FROM
	players;

Returns:

nicknamelevelplayer_id
ymatthews91
rileyjon122
sabrina21113
burchdenise104