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SQL Server LOG() Function

❮ SQL Server Functions

Example

Return the natural logarithm of 2:

SELECT LOG(2);
Try it Yourself »

Definition and Usage

The LOG() function returns the natural logarithm of a specified number, or the logarithm of the number to the specified base.

From SQL Server 2012, you can also change the base of the logarithm to another value by using the optional base parameter.

Note: Also look at the EXP() function.

Syntax

LOG(number, base) -- Syntax for SQL Server

OR:

LOG(number) -- Syntax for Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse

Parameter Values

Parameter Description
number Required. The number to return the natural logarithm of. Must be greater than 0
base Optional. The base the natural logarithm is to be calculated with. Must be greater than 1

Technical Details

Works in: SQL Server (starting with 2008), Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse

More Examples

Example

Return the natural logarithm of 2 to a specified base (4):

SELECT LOG(2, 4);
Try it Yourself »

❮ SQL Server Functions