Web Reference: 3 days ago · Learn how SQL NULL works, why it is different from zero or an empty string, how NULL affects WHERE, JOINs, COUNT, aggregates, sorting, CASE, COALESCE, and how to avoid the most common NULL-related bugs in real queries. 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 · NULL values in SQL are essential for representing missing or inapplicable data. Understanding their behavior, impact on constraints, and three-valued logic is crucial for writing accurate queries.
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