Web Reference: This tutorial introduces you to SQL NOT NULL constraint and shows you how to add the NOT NULL constraints to existing columns SQL NOT NULL Constraint 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. Nov 15, 2024 ยท This article looks at how to use SQL IS NULL and SQL IS NOT NULL operations in SQL Server along with use cases and working with NULL values.
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