Describe what relationship types represent in an ER model and provide examples of unary, binary, ternary, and quaternary relationships.
What will be an ideal response?
A relationship type is a set of associations between one or more participating entity types (see
Section 12.2). Examples:
Unary: Staff Supervise Staff (also called recursive relationship)
Binary: Branch Has Staff
Ternary: Staff Registers Client at Branch
Quaternary: Solicitor Arranges Bid with a Buyer supported by a Financial
Institution.
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