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Oracle® Database SQL Language Reference
11g Release 2 (11.2)

E41084-03
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LOG

Syntax

Description of log.gif follows
Description of the illustration log.gif

Purpose

LOG returns the logarithm, base n2, of n1. The base n1 can be any positive value other than 0 or 1 and n2 can be any positive value.

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

See Also:

Table 3-10, "Implicit Type Conversion Matrix" for more information on implicit conversion

Examples

The following example returns the log of 100:

SELECT LOG(10,100) "Log base 10 of 100"
  FROM DUAL;

Log base 10 of 100
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