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Exam (elaborations) CECS 6605
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1.What is a recursive relationship? How is the recursive relationship denoted diagrammatically in the Chen like ER model? Can all ternary relationships be expressed in the form of binary relationshi ... ps?What is a specialization? Come up with another example of a specialization. Explain. 4.What is an overlap constraint? What symbol shows the overlap constraint in EER diagrams? The overlap constraint indicates that the supertype instance may be a member of the two or more subtypes. Symbols o d means "disjoint"- what it tells is the subclasses must have disjoint sets of entities o O means "overlap" The subclasses may have overlapping sets of entities. o U symbol indicates the Subtype is a subset of the Supertype. o Place o or d in specialization circle to indicate constraint. [Show More]
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