The hierarchical database model is based on a ____.
tree structure
lack of a parent segment
lack of a child segment
matrix
Database models can be grouped into two categories: conceptual models and ____ models.
implementation
logical
physical
query
A(n) ____ model is independent of both hardware and software.
conceptual
external
developmental
Which model represents the end user’s view of the database?
Internal
Conceptual
Physical
External
What type of relationship is expressed with the phrase “Employee manages Store”?
1:M
1:1
M:1
M:N
The key's role is based on a concept known as ____.
consistency
availability
determination
uniqueness
The ERD is used to graphically represent the ____ database model.
condensed
A ____ relationship exists when an association is maintained within a single entity.
unary
ternary
binary
weak
A ____ relationship exists when two entities are associated.
The extended entity relationship model (EERM) is sometimes referred to as the ____.
entity relationship model
enhanced entity relationship model
entity clustering relationship model
extended entity relationship diagram
The property of ____ enables an entity subtype to inherit the attributes and relationships of the supertype.
subtype discriminator
inheritance
specialization hierarchy
entity supertype
