Web Reference: Explore how NULL values affect aggregate functions and learn how to handle them effectively in your SQL queries. Mar 23, 2026 · An aggregate function in the Microsoft SQL Database Engine performs a calculation on a set of values, and returns a single value. Except for COUNT(*), aggregate functions ignore NULL values. Recently, I noticed a lot of questions about how SQL aggregate functions handle NULL values on a discussion board for an article here at SQL Server Central Understanding the difference between IS NULL and =NULL discussion board. This article was written to help answer some of those questions by explaining how SQL aggregate functions handle NULLs, a...
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