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 · By using operators like IS NULL and IS NOT NULL, we can effectively filter and update NULL values to maintain data integrity. Mastery of these concepts ensures reliable data handling in SQL applications. Aug 20, 2025 · The ISNULL function in MS SQL takes two arguments: the first is a value or column name, and the second is the default value if the first argument is null. This query retrieves rows where the code column is either null, an empty string, or contains only spaces.
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