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: 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. Jan 5, 2026 Β· 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.
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