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ISNUMERIC (Transact-SQL)

Windows Server 2003

Updated: 12 December 2006

Determines whether an expression is a valid numeric type.

Topic link icon Transact-SQL Syntax Conventions


ISNUMERIC ( expression )

expression

Is the expression to be evaluated.

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.

Dd820479.note(en-us,MSDN.10).gifNote:
   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.

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

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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