How to Properly Use the T-SQL IsNumeric Function

How to Properly Use the T-SQL IsNumeric Function

Learn how to Properly Use the T-SQL IsNumeric Function. In this article, we'll look at the T-SQL ISNumeric function and how you can use it in your day-to-day SQL scripting tasks.

This article is focused on the T-SQL (Transact-SQL) IsNumeric function and its proper use in day-to-day SQL scripting tasks.

We will also see why it is important to understand how and why IsNumeric can be used – both incorrectly and correctly.

There may be some better alternatives to IsNumeric depending on the context. However, in the cases we’re going to cover in this article, I see this function as the best possible choice.

About IsNumeric

First of all, let’s get familiar with IsNumeric. Here’s what we can say about it after reading the related information in the Microsoft documentation:

Microsoft Definition

The IsNumeric function determines whether an expression can be evaluated as a number. Here, the expression can consist of symbols and operators which are evaluated as a single data value by SQL Server Database Engine.

Please refer to my article Basic to Complex Uses of Not Equal in T-SQL to get more information about expressions and operators.

sql server sql sql functions t-sql

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