database-the-enhanced-e-r-model-and-business-rules Related Question Answers

1. A rectangle represents which of the following in an EER?





2. Which one of the following symbols is not used in an ERD?





3. Specialization is which of the following processes?





4. Which of the following statements concerning business rules is true?





5. A supertype/subtype hierarchy has which of the following features?





6. A subtype discriminator is which of the following?





7. When an entity instance may be a member of multiple subtypes or it does not have to be a member of a subtype, it is which of the following?





8. A subtype entity name should be which of the following?





9. Use of a supertype/subtype relationship is necessary when which of the following exists?





10. Which of the following is not one of the three ways to classify an action assertion?





11. Packaged data models are meant to be exactly right straight out of the box.



12. An action assertion is a statement that expresses some aspect of the static structure of the organization.



13. A supertype can only have only one subtype.



14. There is cardinality on an EER between the supertype and subtype.



15. A subtype discriminator of the supertype is an attribute whose values determine the target subtype(s).



16. Overlapping and disjoint subtypes have different approaches on how the subtype discriminator is applied.



17. An entity instance of a subtype represents the same entity instance of a supertype.



18. A supertype is an entity type that shares common attributes or relationships distinct from other subgroupings.



19. An ERD that has had the entities clustered will display more entities.



20. Total specialization is represented by double lines between the supertype and subtype on an EER.



21. Generalization is the process of defining more general entity types from a set of more specialized entity types.



22. It is appropriate to use a supertype/subtype relationship when there are attributes that apply to some of the instances of an entity type.



23. If an entity adheres to the disjoint rule, then an entity instance can be a member of more than one entity for a given supertype.



24. Action assertions have traditionally been implemented within an application program.



25. An entity cluster is a set of one or more entity types and associated relationships.



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