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

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.

Mar 6, 2012 · SQL provides the special syntax for testing if a column is null, via is null and is not null, which is a special condition to test for a null (or not a null). Here's some SQL showing a variety of …

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 18, 2025 · C. Test for NULL in a WHERE clause Don't use ISNULL to find NULL values. Use IS NULL instead. The following example finds all products that have NULL in the weight column. Note …

This tutorial introduces you to NULL and how to use the SQL IS NULL and IS NOT NULL to test whether an expression is NULL.

When testing for a NULL value, IS NULL is the recommended comparison operator to use in SQL. Let's start by looking at an example that shows how to use the IS NULL condition in a SELECT statement. …

NULL Handling in SQL refers to managing unknown or missing values using operators like IS NULL and IS NOT NULL, since direct comparisons like = NULL do not work. NULL represents the absence of a …

In relational databases, NULL represents the absence of data, not zero or an empty string. Use SQL IS NULL in your WHERE clause to find rows where a specific column has a NULL value. WHERE email …

In SQL, the IS NOT NULL condition is used to select rows if the specified field is NOT NULL. It has the following syntax: SELECT column1, column2, ... Here, For example, Here, the above SQL query …