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A domain constraint implies that a particular attribute of a relation is defined on a particular domain. A domain constraint simply states that values of the attribute in question are required to belong to the set on values constituting the underlying domain.
(Database Fundamentals. Sharma, N. et al. DB2university.com, 1ª. edição, 2010)
A melhor tradução para o termo domain constraint é
The Object-Relational (OR) model is very similar to the relational model; however, it treats every entity as an object (instance of a class), and a relationship as an inheritance. Some features and benefits of an Object-Relational model are:
• Support for complex, user defined types
• Object inheritance
• Extensible objects
(Database Fundamentals. Sharma, N. et al. DB2university.com, 1ª. edição, 2010)
De acordo com o texto,