Web Reference: 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 · We can update the NULL values present in a table using the UPDATE statement in SQL. To do so, we can use the IS NULL operator in the WHERE clause to select the rows with NULL values and then we can set the new value using the SET keyword. Jul 24, 2025 · In this article, I’ll walk you through what NULL values are, share some best practices for handling them, and point out common pitfalls to avoid—all in simple, human terms.
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