Returns values from the row after the current row within the requested window.

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

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Syntax

LEAD ( <expression> [, <offset> [, <default> ]] )
    OVER ( [ PARTITION BY <partition_by> ] ORDER BY <order_by> [ { ASC | DESC } ] )

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Parameters

ParameterDescriptionSupported input types
<expression>Any valid expression that will be returned based on the <offset>.Any
<offset>The number of rows forward from the current row from which to obtain a value. A negative number will act as LAG(). The offset must be a literal INTEGER.INTEGER
<default>The expression to return when the offset goes out of the bounds of the window. Must be a literal of the same type as <expression>. The default is NULL.Any
<partition_by>The expression used for the PARTITION BY clause.Any
<order_by>An expression used for the ORDER BY clause.Any

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Example

In the example below, the LEAD function is being used to find the players in each level who ranked before and after a certain player. In some cases, if the player has no one ranked before or after them, the LEAD function returns NULL.

SELECT
	nickname,
	level,
	LEAD(nickname, -1) OVER (PARTITION BY level ORDER BY nickname) AS player_before,
	LEAD(nickname, 1) OVER (PARTITION BY level ORDER BY nickname) AS player_after
FROM
	players;

Returns:

nicknamelevelplayer_beforeplayer_after
kennethpark9NULLrileyjon
rileyjon9kennethparksabrina21
sabrina219rileyjonymatthews
ymatthews9sabrina21NULL