SUM
Calculate the sum of the values within the requested window.
The SUM function works with numeric values and ignores NULL values.
For more information on usage, please refer to Window Functions.
Syntax
SUM([ DISTINCT ] <value> ) OVER ( [ PARTITION BY <partition_by> ] )
Parameters
| Parameter | Description | Supported input types |
|---|---|---|
<value> | The expression used for the SUM function | Any numeric type |
<partition_by> | An expression used for the PARTITION BY clause | Any |
Return Types
NUMERIC
When DISTINCT is specified, duplicate values from <expression> are removed before calculating the sum.
Example
The example below shows how many players are on a specific level.
SELECT
level,
SUM(players) OVER (PARTITION BY level ) AS current_players
FROM
players;
Returns:
| level | current_players |
|---|---|
| 1 | 156 |
| 2 | 108 |
| 3 | 127 |
| 4 | 198 |
| 5 | 207 |