Database - Data Modeling with ER Model
Database - Data Modeling with ER Model
11. An attribute that names or identifies entity instances is a(n):
- entity.
- attribute.
- identifier.
- relationship.
12. Properties that describe the characteristics of entities are called:
- entities
- attributes.
- identifiers.
- relationships.
13. In which of the following can many entity instances of one type be related to many entity instances of another type?
- One-to-One Relationship
- One-to-Many Relationship
- Many-to-Many Relationship
- Composite Relationship
14. Entities of a given type are grouped into a(n):
- database.
- entity class.
- attribute.
- ERD.
15. Which of the following is NOT a basic element of all versions of the E-R model?
- Entities
- Attributes
- Relationships
- Primary keys
16. In which of the following is a single-entity instance of one type of related to a single-entity instance of another type?
- One-to-One Relationship
- One-to-Many Relationship
- Many-to-Many Relationship
- Composite Relationship
17. Entities can be associated with one another in which of the following?
- Entities
- Attributes
- Identifiers
- Relationships
18. Which type of entity has its relationship to another entity determined by an attribute in that other entity called a discriminator?
- Supertype entity
- Subtype entity
- Archetype entity
- Instance entity
19. Which type of entity represents a logical generalization whose actual occurrence is represented by a second, associated entity?
- Supertype entity
- Subtype entity
- Archetype entity
- Instance entity
20. In a one-to-many relationship, the entity that is on the many side of the relationship is called a(n) ________ entity.
- parent
- child
- instance
- subtype