ln-ssis-expression.md

title	LN (SSIS Expression)
description	LN (SSIS Expression)
author	chugugrace
ms.author	chugu
ms.date	03/01/2017
ms.service	sql
ms.subservice	integration-services
ms.topic	concept-article
helpviewer_keywords	LN function natural logarithm of expression [Integration Services]

LN (SSIS Expression)

[!INCLUDEsqlserver-ssis]

Returns the natural logarithm of a numeric expression.

Syntax

  
LN(numeric_expression)  

Arguments

numeric_expression
Is a valid non-zero and non-negative numeric expression.

Result Types

DT_R8

Remarks

The numeric expression is cast to the DT_R8 data type before the logarithm is computed. For more information, see Integration Services Data Types.

If numeric_expression evaluates to zero or a negative value, the return result is null.

Expression Examples

This example uses a numeric literal. The function returns the value 3.737766961828337.

LN(42)  

This example uses the column Length. If the column value is 53.99, the function returns 3.9887988442302.

LN(Length)   

This example uses the variable Length. The variable must have a numeric data type or the expression must include an explicit cast to a numeric data type. If Length is 234.567, the function returns 5.45774126708797.

LN(@Length)   

See Also

LOG (SSIS Expression)
Functions (SSIS Expression)