LN

Syntax

Description of the illustration ln.eps

Purpose

LN returns the natural logarithm of n, where n is greater than 0.

This function takes as an argument any numeric data type or any nonnumeric data type that can be implicitly converted to a numeric data type. If the argument is BINARY_FLOAT, then the function returns BINARY_DOUBLE. Otherwise the function returns the same numeric data type as the argument.

See Also:

Table 2-8 for more information on implicit conversion

Examples

The following example returns the natural logarithm of 95:

SELECT LN(95) "Natural log of 95"
  FROM DUAL;

Natural log of 95
-----------------
       4.55387689