## Syntax
```mermaid
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'themeVariables': {
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flowchart LR
Start((START)) --> LN[LN]:::quoted
LN --> End((END))
```
## Purpose
The `LN` SQL function gets the natural logarithm of a number. In contrast to [[LOG]], no base can be specified; the base is always the number `e`.
See also [[LOG]] and [[EXP]].
Parameters:
- Input (`decimal`): a number to get the natural logarithm from.
Returns: the natural logarithm of the input.
## Examples
The following example retrieves the natural logarithm of 1:
```sql
select ln(1)
-------------------
0
```
The following example retrieves the natural logarithm of the number e:
```sql
select ln(exp(1))
-------------------
1
```