Web Reference: What is a NULL Value? If a field in a table is optional, it is possible to insert or update a record without adding any value to this field. This way, the field will be saved with a NULL value. A NULL value represents an unknown, missing, or inapplicable data in a database field. Jan 5, 2026 · To handle such scenarios, SQL provides a special placeholder value called NULL to represent unknown, unavailable, or inapplicable data. It is essential to understand that a NULL value differs from a zero or an empty string. A NULL value represents missing or undefined data. 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.
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