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 SQL, NULL represents an unknown value, so comparing it with = or != always returns false. Instead, you must use IS NULL or IS NOT NULL to check for NULL values. 1 day ago · The most important SQL NULL skill is handling it intentionally in filters, joins, aggregates, CASE logic, and reporting so your query results stay correct and your business meaning stays clear. FAQ What does NULL mean in SQL? NULL in SQL represents a missing, unknown, or not applicable value. It is not the same as zero, false, or an empty string.
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