Web Reference: Definition and Usage The ISNULL () function returns a specified value if the expression is NULL. If the expression is NOT NULL, this function returns the expression. Syntax ISNULL (expression, value) Sep 14, 2023 · Instead, you need to use the IS NULL or IS NOT NULL operators to check for NULL values. Handling NULL in expressions: When performing arithmetic or other operations involving NULL values, the result typically becomes NULL. Mar 18, 2021 · The built in system functions in Microsoft SQL Server are used to perform system operations and return information about objects or settings in SQL Server. The ISNULL () function is used to check if a value is null and if it is will return the replacement value specified when calling the function.
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