# LN

The LN function returns the natural logarithm of a number with base e, the constant equal to 2.71828182845904. The LN function returns NULL if number is less than or equal to 0.

The LN function has the following format:

`LN(`

*n*)

- where
*n*is greater than 0

A natural logarithm LN(n) is the inverse of the EXP( ) function and takes as arguments any numeric data, including metrics, metrics expressions, and constants.

**Syntax**

` SELECT LN(…)`

` SELECT LN(number)`

**Examples**

`SELECT LN(10)`

` SELECT LN(1/12)`

` SELECT LN(1.5)`

` SELECT LN(SUM(Amount))`