"Describes the inclusion of attribute rules (for example, maximum discount and minimum order quantity) within the design of a database." (Owen Williams, "MCSE TestPrep: SQL Server 6.5 Design and Implementation", 1998)
"Integrity that enforces valid entries for a given column. Domain integrity is enforced by restricting the type (through data types), the format (through CHECK constraints and rules), or the range of possible values (through REFERENCE and CHECK constraints, and rules)." (Microsoft Corporation, "SQL Server 7.0 System Administration Training Kit", 1999)
"Domain integrity enforces the validity of entries for a given column. The mechanism, such as the CHECK constraint, can restrict the possible data values by data type, format, or range of values allowed." (Anthony Sequeira & Brian Alderman, "The SQL Server 2000 Book", 2003)
"A relational database integrity mechanism that enforces the validity of data at the column level." (Marilyn Miller-White et al, "MCITP Administrator: Microsoft® SQL Server™ 2005 Optimization and Maintenance 70-444", 2007)
"The validity of entries for a specific column of data." (Microsoft, "SQL Server 2012 Glossary", 2012)
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