LN

Syntax

Purpose

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

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

See Also:

Table 2-10, "Implicit Type Conversion Matrix" 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