In implementation terms, an entity is existence-dependent if it has a mandatory primary key.
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Q15: In the entity relationship model, a table
Q16: Composite attributes make it easier to facilitate
Q17: To implement a small database, a database
Q18: In a 1:M relationship, to avoid the
Q19: Software vendors have adopted the Chen representation
Q21: A _ attribute can be further subdivided
Q22: Ideally, an entity identifier is composed of
Q23: If an entity can exist apart from
Q24: The conceptual model can handle _ relationships
Q25: In the entity relationship diagram (ERD), cardinality
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