What are the Object Role Modeling (ORM) constraints?
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What are the Object Role Modeling (ORM) constraints?
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The Object Role Modeling (ORM) constraints define how objects participate in a relationship. The constraints also define which objects are mandatory and the multiplicity of the relationship. A closed circle is attached to either end of a connection to indicate the mandatory objects in the relationship. This circle indicates that the given object is mandatory in the relationship. Multiplicity indicates whether two objects are related to each other as one-to-one, one-to-many, and many-to-many.
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