Web Reference: The following SQL creates a CHECK constraint on the "Age" column upon creation of the "Persons" table. Here, the CHECK constraint ensures that the "Age" column must have a value of 18, or above: Feb 10, 2026 · The CHECK constraint in SQL ensures that only valid data enters a column by enforcing specific conditions. If a value doesn’t satisfy the defined rule, the insert or update operation is blocked. Nov 18, 2025 · Learn how to can create a check constraint in a table to specify the data values that are acceptable in one or more columns in the SQL Server Database Engine.
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