There is usually only one instance of an entity in an entity class.
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Q6: The subtype symbol is a circle with
Q7: Maximum cardinality indicates whether or not an
Q8: Recursive relationships occur when an entity has
Q9: Which of the following is true about
Q10: When an entity class has a relationship
Q12: Unified Modeling Language (UML)has quickly replaced the
Q13: In the Entity-Relationship data model,all instances of
Q14: The number of entity classes involved in
Q15: One or more entities can be associated
Q16: It is possible for an entity to
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