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


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

See Also:

Table 2-10, "Implicit Type Conversion Matrix" for more information on implicit conversion


The following example returns the log of 100:

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

Log base 10 of 100