Definition and Usage The ISNULL () function returns a specified value if the expression is NULL. If the expression is NOT NULL, this function returns the expression. Syntax ISNULL (expression, value)

Nov 18, 2025 · The following example uses ISNULL to replace a NULL value for Color, with the string None.

In this tutorial, you will learn how to use the SQL Server ISNULL () function to replace NULL with a specified value.

Mar 18, 2021 · Learn about the SQL Server ISNULL function and the many ways it can be used with TSQL statements.

The ISNULL () function returns the input expression value if it is not a NULL. In the following example, the given expression 'SQL Server' is not a null value and hence ISNULL returns the expression as it …

Apr 7, 2025 · Thankfully, there are a few SQL Server functions devoted to handling NULL values. Let’s look at two of them. The first, NULLIF, will help you to return a NULL value. The second, ISNULL, will …

It is a convenient way to handle NULLs in SQL queries and expressions. The ISNULL function takes two parameters—the expression to be checked for NULL and the value to be returned if the expression is …

Mar 24, 2024 · It’s meant to be used as an error handling tool of sorts. The ISNULL function is meant to return a non- NULL value in places where NULL may occur. Here is the general syntax: The idea is …

This SQL Server tutorial explains how to use the ISNULL function in SQL Server (Transact-SQL) with syntax and examples. In SQL Server (Transact-SQL), the ISNULL function lets you return an …

Jul 11, 2025 · In SQL Server, ISNULL and NULLIF are two essential functions used to handle NULL values, but they serve very different purposes. ISNULL is used to replace NULL with a specified …