Web Reference: 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. This tutorial shows you how to use the SQL Server CHECK constraint to limit the values that can be inserted or updated into one or more columns in a table 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:
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