Web Reference: Jul 27, 2015 · In SQL Server (but not in Oracle I think), if a value is null and it is used to compare equlaity or inequality it will not be considered becasue null means I don't know the value and thus is not an actual value. Apr 4, 2022 · As usual your mileage may vary with using IS NULL vs ISNULL in your queries; however, it is a best practice to not do things that prevent a query from being sargable if at all possible. 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.
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