Web Reference: The NOT NULL constraint enforces a column to NOT accept NULL values. This enforces a field to always contain a value, which means that you cannot insert a new record, or update a record without adding a value to this field. By default, a column can hold NULL values. Feb 10, 2026 · In SQL, NOT NULL constraint in SQL ensures a column must always contain a value and cannot be left empty. Unlike a PRIMARY KEY, which uniquely identifies each record and also disallows NULLs, NOT NULL only enforces the presence of data without requiring uniqueness. In SQL, the NOT NULL constraint in a column means that the column cannot store NULL values. In this tutorial, you will learn about the SQL NOT NULL constraint with the help of examples.
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