ISNUMERIC (Transact-SQL)

ISNUMERIC (Transact-SQL)

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SQL Server 2005 Books Online (November 2008)

ISNUMERIC (Transact-SQL)

Updated: 12 December 2006

Determines whether an expression is a valid numeric type.

Topic link icon Transact-SQL Syntax Conventions

Syntax

ISNUMERIC ( expression )

Arguments

expression: Is the expression to be evaluated.

Return Types

int

Remarks

ISNUMERIC returns 1 when the input expression evaluates to a valid numeric data type; otherwise it returns 0. Valid numeric data types include the following:

int	numeric
bigint	money
smallint	smallmoney
tinyint	float
decimal	real

A return value of 1 indicates that expression can be converted to at least one of the numeric types.

Note:
ISNUMERIC returns 1 for some characters that are not numbers, such as plus (+), minus (-), and valid currency symbols such as the dollar sign ($). For a complete list of currency symbols, see Using Monetary Data.

Examples

The following example uses ISNUMERIC to return all the postal codes that are not numeric values.

USE AdventureWorks;
GO
SELECT City, PostalCode
FROM Person.Address 
WHERE ISNUMERIC(PostalCode)<> 1;
GO

Change History

Release	History
12 December 2006	New content: Added the format descriptions for the input expression.
14 April 2006	New content: Added note about additional characters.

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