Web Reference: The COALESCE() function is the preferred standard for handling potential NULL values. The COALESCE() function returns the first non-NULL value in a list of values. Jul 24, 2025 · In SQL, NULL means “unknown” or “missing,” and it can make your queries behave in unexpected ways if you’re not careful. In this article, I’ll walk you through what NULL values are, share some best practices for handling them, and point out common pitfalls to avoid—all in simple, human terms. In this lesson you'll learn what NULL actually means, how to test for it, how to substitute a fallback with COALESCE(), and how to use NULLIF() to turn problematic values into NULL on purpose. NULL means unknown or absent. It is not zero. It is not an empty string. It is the absence of a value.
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