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 · If a literal NULL is provided as check_expression, ISNULL returns the data type of the replacement_value. If a literal NULL is provided as check_expression and no replacement_value is …

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

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 …

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

Jan 11, 2026 · Learn ISNULL () function in SQL Server with simple syntax and real examples. Understand NULL handling, calculations, WHERE usage, best practices, and interview MCQs.

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 …

In SQL Server, the ISNULL function is used to replace NULL values with a specified replacement value. It is a convenient way to handle NULLs in SQL queries and expressions.

May 10, 2019 · We can use SQL ISNULL to replace existing NULL values with a specific value. For example, we want to return Employee salary 10,000 if it is NULL in the Employee table.

Jul 23, 2025 · The ISNULL() function in SQL Server is a powerful tool for handling NULL values in our database queries. It allows us to replace NULL values with a specified replacement value, ensuring …