Subtypes that contain nonunique subsets of the supertype entity set are known as _____ subtypes.
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Q51: If one exists, a data modeler uses
Q52: Usually, a data modeler uses a natural
Q53: A _ is a primary key created
Q54: The _ specifies whether each entity supertype
Q55: According to the "preferably single-attribute" characteristic of
Q57: The most important characteristic of an entity
Q58: _ completeness means that every supertype occurrence
Q59: Composite primary keys are particularly useful as
Q60: Disjoint subtypes are also known as _
Q61: Explain the two criteria that help a
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