## Syntax
```mermaid
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'themeVariables': {
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flowchart LR
Start((START)) --> SIGN[SIGN]:::quoted
SIGN --> End((END))
```
## Purpose
The `SIGN` SQL function returns the sign of a number, with -1 representing a negative number, 1 a positive number and 0 a zero.
See also [[ABS]].
Parameters:
- Input (`decimal`): A number.
Returns: the sign as an `int32`.
## Examples
The following example retrieves the sign of a negative number, a zero and a positive number:
```sql
select sign(-0.65565) negative
, sign(0) neutral
, sign(+20) positive
-------- -------- --------
-1 0 1
```
The following example returns `null` since the input is `null`:
```sql
select sign(null)
--------
```