Chapter 8 Flashcards
The entity-relationship model is a _______ data modeling used to capture the overall structure of data in an organization.
conceptual
In the ER model, a person, place, object, event or concept in the user environment about
which data is to be maintained is called a(n) _______.
Entity
In the ER model, a named propety or characteistic of an entity that is of interest to the
organization is refered to as a(n) _______.
Attribute
The number of entity types that paticipate in a relationship is refered to as the _______.
Degree
The _______ is the number of instances of one entity that can be associated with each
instance of another entity.
Cardinality
In a data model for a hospital, a patient is descibed either as an outpatient or a resident
patient. In this model the patient represents a _______.
Super-Type
In the previous hospital data model case, each patient must be either a outpatient or a
resident patient. This illustrates a case of _______ specialization
Total and disjoint
The _______ is the set of all data types and values that an attibute can assume.
domain
