Web Reference: Nov 18, 2025 ยท 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 the space between IS and NULL. 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) The ISNULL () function returns the input expression value if it is not a NULL. In the following example, the given expression 'SQL Server' is not a null value and hence ISNULL returns the expression as it is without replacing it.
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