The _____ specifies whether each entity supertype occurrence must also be a member of at least one subtype.
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Q49: The "_" characteristic of a primary key
Q50: The "_" characteristic of a primary key
Q51: If one exists, a data modeler uses
Q52: Usually, a data modeler uses a natural
Q53: A _ is a primary key created
Q55: According to the "preferably single-attribute" characteristic of
Q56: Subtypes that contain nonunique subsets of the
Q57: The most important characteristic of an entity
Q58: _ completeness means that every supertype occurrence
Q59: Composite primary keys are particularly useful as
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