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LOG10 (Transact-SQL)

Applies To: SQL Server 2014, SQL Server 2016 Preview

Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).

Returns the base-10 logarithm of the specified float expression.

Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database, Azure SQL Data Warehouse Public Preview.

Topic link icon Transact-SQL Syntax Conventions

LOG10 ( float_expression )

float_expression

Is an expression of type float or of a type that can be implicitly converted to float.

The LOG10 and POWER functions are inversely related to one another. For example, 10 ^ LOG10(n) = n.

A. Calculating the base 10 logarithm for a variable.

The following example calculates the LOG10 of the specified variable.

DECLARE @var float;
SET @var = 145.175643;
SELECT 'The LOG10 of the variable is: ' + CONVERT(varchar,LOG10(@var));
GO

Here is the result set.

The LOG10 of the variable is: 2.16189    

(1 row(s) affected)

B. Calculating the result of raising a base-10 logarithm to a specified power.

The following example returns the result of raising a base-10 logarithm to a specified power.

SELECT POWER (10, LOG10(5)); 

Here is the result set.

-----------
5

(1 row(s) affected)

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