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title: "LOG10 (Transact-SQL) | Microsoft Docs" ms.custom: "" ms.date: "03/06/2017" ms.prod: sql ms.prod_service: "database-engine, sql-database, sql-data-warehouse, pdw" ms.component: "t-sql|functions" ms.reviewer: "" ms.suite: "sql" ms.technology: t-sql ms.tgt_pltfrm: "" ms.topic: "language-reference" f1_keywords:

  • "LOG10"
  • "LOG10_TSQL" dev_langs:
  • "TSQL" helpviewer_keywords:
  • "float expressions"
  • "LOG10 function"
  • "base-10 logarithms"
  • "logarithm of expression" ms.assetid: 1eb7fb34-1937-4a39-a936-f5c0c7c7e06f caps.latest.revision: 23 author: edmacauley ms.author: edmaca manager: craigg monikerRange: ">= aps-pdw-2016 || = azuresqldb-current || = azure-sqldw-latest || >= sql-server-2016 || = sqlallproducts-allversions"

LOG10 (Transact-SQL)

[!INCLUDEtsql-appliesto-ss2008-all-md]

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

Topic link icon Transact-SQL Syntax Conventions

Syntax

LOG10 ( float_expression )

Arguments

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

Return Types

float

Remarks

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

Examples

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

[!INCLUDEssResult]

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));

[!INCLUDEssResult]

-----------  
5  
  
(1 row(s) affected)

Examples: [!INCLUDEssSDWfull] and [!INCLUDEssPDW]

C: Calculating the base 10 logarithm for a value.

The following example calculates the LOG10 of the specified value.

SELECT LOG10(145.175642);

[!INCLUDEssResult]

-------------------  
2.16

See Also

Mathematical Functions (Transact-SQL)
POWER (Transact-SQL)
LOG (Transact-SQL)