SQL Server The SQL Server ISNULL() function lets you return an alternative value when an expression is NULL:

Nov 18, 2025 · To determine whether an expression is NULL, use IS NULL or IS NOT NULL instead of comparison operators (such as = or !=). Comparison operators return UNKNOWN when either or …

Nov 17, 2025 · The SQL IS NULL operator checks whether a column contains a NULL (missing or unknown) value. Since NULL is not the same as zero or an empty string, IS NULL is used in the …

Nov 15, 2024 · This article looks at how to use SQL IS NULL and SQL IS NOT NULL operations in SQL Server along with use cases and working with NULL values.

This SQL tutorial explains how to use the SQL IS NULL condition with syntax and examples. The IS NULL condition is used in SQL to test for a NULL value. It returns TRUE if a NULL value is found, …

This SQL tutorial covers how to work with null values by using SQL's IS NULL operator to select rows where a column contains no data.

IS NULL and NOT NULL in SQL are used to check if any field contains null values. In this tutorial, you will learn about the SQL IS NULL and NOT NULL with the help of examples.

3 days ago · Learn about SQL IS NULL and IS NOT NULL with different examples. Understand syntax, common mistakes to avoid, best practices, and more. Read now.

Summary: in this tutorial, you will learn about NULL and three-valued logic in SQL Server. You will also learn how to use IS NULL and IS NOT NULL operators to test whether a value is NULL or not. In the …

The IS NULL operator is used to test for empty values (NULL values). The following SQL lists all customers with a NULL value in the "Address" field: Tip: Always use IS NULL to look for NULL …