_____ completeness means that every supertype occurrence must be a member of at least one subtype.
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Q53: A _ is a primary key created
Q54: The _ specifies whether each entity supertype
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
Q59: Composite primary keys are particularly useful as
Q60: Disjoint subtypes are also known as _
Q61: Explain the two criteria that help a
Q62: A(n) _ occurs when you have one
Q63: A weak entity in a strong identifying
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