Amazon Redshift will no longer support the use of Python UDFs after June 30, 2026.
We will start enforcing it in phases. For more information on the details of Python end of life
and migration options, see the
blog post
LOG function
Returns logarithm of a number.
If you're using this function to calculate the base 10 logarithm, you can also use DLOG10 function.
Syntax
LOG([base, ]argument)
Parameters
- base
-
(Optional) The base of the logarithm function. This number must be positive and can't equal
1. If this parameter is omitted, Amazon Redshift computes the base 10 logarithm of the argument. - argument
-
The argument of the logarithm function. This number must be positive. If the argument value is
1, the function returns0.
Return type
The LOG function returns a DOUBLE PRECISION number.
Examples
To find the base 2 logarithm of 100, use the following example.
SELECT LOG(2, 100);+-------------------+ | log | +-------------------+ | 6.643856189774725 | +-------------------+
To find the base 10 logarithm of 100, use the following example. Note that if you omit the base parameter, Amazon Redshift assumes a base of 10.
SELECT LOG(100);+-----+ | log | +-----+ | 2 | +-----+