Web Reference: Feb 10, 2026 · The SQL IS NULL operator checks whether a column contains a NULL (missing or unknown) value. Since NULL is not the same as zero or an empty string, IS NULL is used in the WHERE clause to filter rows where a value is absent. The IS NULL operator is used to test for empty values (NULL values). The following SQL lists all customers with a NULL value in the "Address" field: Tip: Always use IS NULL to look for NULL values. The IS NOT NULL operator is used to test for non-empty values (NOT NULL values). Nov 18, 2025 · To determine whether an expression is NULL, use IS NULL or IS NOT NULL instead of comparison operators (such as = or !=). Comparison operators return UNKNOWN when either or both arguments are NULL.
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