In SQL Server, a NULL worth represents the absence of a worth for a selected column. NULL values are completely different from empty strings, zeros, or areas, as they point out that no information is offered for that subject. Checking for NULL values is essential in information administration and evaluation, because it permits you to deal with lacking or incomplete information successfully.
There are a number of methods to verify for NULL values in SQL Server. One frequent methodology is to make use of the IS NULL operator. The IS NULL operator returns TRUE if the desired expression is NULL, and FALSE if it’s not. For instance: