Disjoint subtypes are subtypes that contain nonunique subsets of the supertype entity set.

49 Questions  |  By Sonfackjoyce677 | Last updated: Mar 21, 2022 | Total Attempts: 157

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Do you know what is database management? Database management allows the user to organize, store and retrieve information from a computer. It can also describe the data storage, operations, and security practices of a database administrator. This quiz will require you to know things like how entity subtypes and supertypes are organized in a specialization hierarchy and important inheritance characteristics. This quiz will teach you about database management and what it entails.

• 1. 

  Entity supertypes and subtypes are organized in a specialization hierarchy.

  • A. 

    True

  • B. 

    False

• 2. 

  Within a specialization hierarchy, a supertype can exist only within the context of a subtype.

  • A. 

    True

  • B. 

    False

• 3. 

  The entity supertype contains the common characteristics and the entity subtypes contain the unique characteristics of each entity subtype.

  • A. 

    True

  • B. 

    False

• 4. 

  The property of the subtype discriminator enables an entity supertype to inherit the attributes and relationships of the subtype.

  • A. 

    True

  • B. 

    False

• 5. 

  One important inheritance characteristic is that all entity subtypes inherit their primary key attribute from their supertype.

  • A. 

    True

  • B. 

    False

• 6. 

  At the implementation level, the supertype and its subtype(s) depicted in the specialization hierarchy maintain a 1:1 relationship.

  • A. 

    True

  • B. 

    False

• 7. 

  Entity subtypes do not inherit the relationships in which the supertype entity participates.

  • A. 

    True

  • B. 

    False

• 8. 

  In specialization hierarchies with multiple levels of supertype/subtypes, a lower-level supertype inherits all of the attributes and relationships from all of its upper-level subtypes.

  • A. 

    True

  • B. 

    False

• 9. 

  An entity supertype can have disjoint or overlapping entity subtypes.

  • A. 

    True

  • B. 

    False

• 10. 

  Overlapping subtypes are subtypes that contain a unique subset of the supertype entity set.

  • A. 

    True

  • B. 

    False

• 11. 

  Disjoint subtypes are subtypes that contain nonunique subsets of the supertype entity set.

  • A. 

    True

  • B. 

    False

• 12. 

  Implementing non-overlapping subtypes requires the use of one discriminator attribute for each subtype.

  • A. 

    True

  • B. 

    False

• 13. 

  The completeness constraint can be partial or total.

  • A. 

    True

  • B. 

    False

• 14. 

  Generalization is based on grouping unique characteristics and relationships of the subtypes.

  • A. 

    True

  • B. 

    False

• 15. 

  Specialization is the top-down process of identifying lower-level, more specific entity subtypes from a higher-level entity supertype.

  • A. 

    True

  • B. 

    False

• 16. 

  An entity cluster is a "virtual" entity type used to represent multiple entities and relationships in the ERD.

  • A. 

    True

  • B. 

    False

• 17. 

  To model time-variant data, you must create a new entity in an M:N relationship with the original entity.

  • A. 

    True

  • B. 

    False

• 18. 

  A design trap occurs when a relationship is improperly or incompletely identified and, therefore, is represented in a way that is not consistent with the real world.

  • A. 

    True

  • B. 

    False

• 19. 

  Some designs use redundant relationships as a way to simplify the design.

  • A. 

    True

  • B. 

    False

• 20. 

  The extended entity relationship model (EERM) is sometimes referred to as the ____.

  • A. 

    Entity relationship model

  • B. 

    Enhanced entity relationship model

  • C. 

    Entity clustering relationship model

  • D. 

    Extended entity relationship diagram

• 21. 

  ____ is a generic entity type that is related to one or more entity subtypes.

  • A. 

    A subtype discriminator

  • B. 

    Inheritance

  • C. 

    A specialization hierarchy

  • D. 

    An entity supertype

• 22. 

  The ____ depicts the arrangement of higher-level entity supertypes (parent entities) and lower-level entity subtypes (child entities).

  • A. 

    Subtype discriminator

  • B. 

    Inheritance

  • C. 

    Specialization hierarchy

  • D. 

    Entity supertype

• 23. 

  The relationships depicted within the ____ are sometimes described in terms of "is-a" relationships.

  • A. 

    Subtype discriminator

  • B. 

    Inheritance

  • C. 

    Specialization hierarchy

  • D. 

    Entity supertype

• 24. 

  Every subtype can have ____ supertype(s) to which it is directly related.

  • A. 

    Zero

  • B. 

    Only one

  • C. 

    One or many

  • D. 

    Many

• 25. 

  A specialization hierarchy can have ____ level(s) of supertype/subtype relationships.

  • A. 

    Zero

  • B. 

    Only one

  • C. 

    One or many

  • D. 

    Many

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