A compound identifier is an identifier consisting of two or more attributes.
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Q9: Entities of a given type are grouped
Q10: A binary relationship is a relationship between
Q11: An identifier serves the same role for
Q12: Entities can be associated with one another
Q13: An entity class is described by the
Q15: E-R modeling recognizes both relationship classes and
Q16: A composite identifier is defined as a
Q17: An identifier of an entity instance must
Q18: In E-R modeling,entities within an entity class
Q19: An entity instance is an occurrence of
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