IS [NOT] NULL (Transact-SQL)
Determines whether a specified expression is NULL.
Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database.
The following example returns the name and the weight for all products for which either the weight is less than 10 pounds or the color is unknown, or NULL.
USE AdventureWorks2012; GO SELECT Name, Weight, Color FROM Production.Product WHERE Weight < 10.00 OR Color IS NULL ORDER BY Name; GO