LOG Function

1. Description

The LOG function computes the natural logarithm (base e) or the logarithm with a specified base of a given numeric value. It converts a positive number to its corresponding logarithmic value and is widely used in mathematical computation, data analysis, and scientific applications. By specifying a base, the LOG function can also compute logarithms for any base, meeting diverse computational needs.

2. Syntax

The syntax of the LOG function is as follows:

LOG(base, number)

Parameters:

• number: Must be a positive number, representing the value for which to compute the logarithm.
• base (optional): Specifies the base of the logarithm. If not specified, the natural logarithm (base e) is used by default.

Return value:

• The return value is the logarithm of number, of floating-point type.

3. Examples

Compute the logarithm with a specified base.

SELECT LOG(2, 8) AS log_base_2;
+------------+
| log_base_2 |
+------------+
| 3          |
+------------+