Web Reference: Nov 18, 2025 · If a literal NULL is provided as check_expression, ISNULL returns the data type of the replacement_value. If a literal NULL is provided as check_expression and no replacement_value is provided, ISNULL returns an int. 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) Apr 7, 2025 · Thankfully, there are a few SQL Server functions devoted to handling NULL values. Let’s look at two of them. The first, NULLIF, will help you to return a NULL value. The second, ISNULL, will help you with an alternative to a NULL value if you need another value in its place.
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