> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/reference/sql-functions/numeric-functions/ln.md).

# LN

## Syntax

```bnf
LN(X)
```

## Description

Returns the natural logarithm of X; that is, the base-e logarithm of X. If X is less than or equal to 0, or `NULL`, then `NULL` is returned.

The inverse of this function is [EXP()](/docs/server/reference/sql-functions/numeric-functions/exp.md).

## Examples

```sql
SELECT LN(2);
+-------------------+
| LN(2)             |
+-------------------+
| 0.693147180559945 |
+-------------------+

SELECT LN(-2);
+--------+
| LN(-2) |
+--------+
|   NULL |
+--------+
```

<sub>*This page is licensed: GPLv2, originally from*</sub> [<sub>*fill\_help\_tables.sql*</sub>](https://github.com/MariaDB/server/blob/main/scripts/fill_help_tables.sql)

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