An identifier serves the same role for a table that a key does for an entity.
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Q6: An entity is something that users want
Q7: An identifier of an entity instance is
Q8: An entity instance of an entity class
Q9: Entities of a given type are grouped
Q10: A binary relationship is a relationship between
Q12: Entities can be associated with one another
Q13: An entity class is described by the
Q14: A compound identifier is an identifier consisting
Q15: E-R modeling recognizes both relationship classes and
Q16: A composite identifier is defined as a
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