Web Reference: Explore how NULL values affect aggregate functions and learn how to handle them effectively in your SQL queries. Mar 23, 2026 ยท 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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