Web Reference: Jan 5, 2026 · Some records in an SQL table may not have values for every field, and such fields are termed NULL values. These occur when data is unavailable during entry or when an attribute does not apply to a specific record. 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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