Web Reference: Operations involving NULL values can sometimes lead to unexpected results. SQL has some built-in functions to handle NULL values, and the most common functions are: 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. 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.
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