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. 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. Mar 24, 2021 · Learn all about NOT NULL constraints in SQL – how they work, what they do, and how to use them – in this 10-minute read.
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Sql Not Null Constraint Sql Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
Estimated Worth: $79M - $112M
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Last Updated: April 7, 2026
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