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

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 …

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 …

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 …

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.

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.

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.

Jan 4, 2026 · In SQL, the equality operator (=) cannot be used to test for null values. This is because null is not equal to anything, including another null. Therefore, a specific operator is …

The SQL IS NULL operator is used to check if a column contains a NULL value. In SQL, NULL is a special marker that represents missing, undefined, or unknown data. It is not the same as …

Learn how to use SQL IS NULL to filter missing values. See syntax, usage examples, and best practices for querying NULLs.