## Syntax
```mermaid
%%{init: {
'theme': 'base',
'flowchart': { 'padding': '7', 'nodeSpacing': '20', 'rankSpacing': '20' },
'themeVariables': {
'fontSize': '11px',
'fontFamily': 'Arial'
}
}}%%
flowchart LR
sumAggregateFunction_start((START))
sumAggregateFunction_start --> sumAggregateFunction_0_0[SUM]:::quoted
sumAggregateFunction_0_0 --> sumAggregateFunction_0_1["("]:::quoted
sumAggregateFunction_0_1 --> sumAggregateFunction_0_2[DISTINCT]:::quoted
sumAggregateFunction_0_2 --> sumAggregateFunction_0_3[<a href="Invantive UniversalSQL/Grammar/Expression" class="internal-link">expression</a>]
sumAggregateFunction_0_3 --> sumAggregateFunction_0_4[")"]:::quoted
sumAggregateFunction_0_4 --> sumAggregateFunction_end((END))
```
## Purpose
Group function to sum together individual numerical values. Occurrences of null are considered 0, unless there are only null values. In that case the outcome is null.