COUNT

Count the number of values within the requested window.

For more information on usage, please refer to Window Functions

Syntax

COUNT( <value> ) OVER ( [ PARTITION BY <partition_by> ] )

Parameter	Description	Supported input types
`<value>`	A value used for the `COUNT()` function.	Any numeric type
`<partition_by>`	An expression used for the `PARTITION BY` clause.	Any

NUMERIC

The following example generates a count of how many video game players have registered on a specific day:

SELECT
	registeredon,
	COUNT(agecategory) OVER (PARTITION BY registeredon) AS count_of_players
FROM
	players;

Returns: