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SQL ServerLOG() Function

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 specifiednumber, or the logarithm of thenumber to the specifiedbase.

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 theEXP() 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

ParameterDescription
numberRequired. The number to return the natural logarithm of. Must be greater than 0
baseOptional. 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 »

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