Domain Integrity
Domain integrity controls the validation of values for a column. You can use domain integrity to enforce the type, format, and possible values of data stored in a column. SQL Server provides several mechanisms to enforce domain integrity:
• You can control the type of data stored in a column by assigning a data type to the column.
• You can use CHECK constraints and rules to control the format of the data.
• You can control the range of values stored in a column by using FOREIGN KEY constraints, CHECK constraints, default definitions, nullability, and rules.
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