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  1. An attribute that names or identifies entity instances is a(n):

  2. A.

     entity.

    B.

     attribute.

    C.

     identifier.

    D.

     relationship.

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  3. Properties that describe the characteristics of entities are called:

  4. A.

     entities.

    B.

     attributes.

    C.

     identifiers.

    D.

     relationships.

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  5. In which of the following can many entity instances of one type be related to many entity instances of another type?

  6. A.

     One-to-One Relationship

    B.

     One-to-Many Relationship

    C.

     Many-to-Many Relationship

    D.

     Composite Relationship

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  7. Entities of a given type are grouped into a(n):

  8. A.

     database.

    B.

     entity class.

    C.

     attribute.

    D.

     ERD.

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  9. Which of the following is NOT a basic element of all versions of the E-R model?

  10. A.

     Entities

    B.

     Attributes

    C.

     Relationships

    D.

     Primary keys

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  11. In which of the following is a single-entity instance of one type of related to a single-entity instance of another type?

  12. A.

     One-to-One Relationship

    B.

     One-to-Many Relationship

    C.

     Many-to-Many Relationship

    D.

     Composite Relationship

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  13. Entities can be associated with one another in which of the following?

  14. A.

     Entities

    B.

     Attributes

    C.

     Identifiers

    D.

     Relationships

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  15. Which type of entity has its relationship to another entity determined by an attribute in that other entity called a discriminator?

  16. A.

     Supertype entity

    B.

     Subtype entity

    C.

     Archetype entity

    D.

     Instance entity

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  17. Which type of entity represents a logical generalization whose actual occurrence is represented by a second, associated entity?

  18. A.

     Supertype entity

    B.

     Subtype entity

    C.

     Archetype entity

    D.

     Instance entity

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  19. In a one-to-many relationship, the entity that is on the many side of the relationship is called a(n) ________ entity.

  20. A.

     parent

    B.

     child

    C.

     instance

    D.

     subtype

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