Exam 4: Data Modeling and the Entity Relationship Model

________ can be used to build prototype databases.

In the Entity-Relationship data model,all instances of an entity of a given type are grouped into:

There is usually only one instance of an entity in an entity class.

Distinguish between entity identifiers and keys.

In crow's foot style E-R diagrams,a hash mark across the relationship line near an entity indicates:

A dashed line between entities indicates:

Distinguish between an entity class and an entity instance.

The number of entity classes involved in a relationship is known as the relationship's:

In crow's foot E-R notation,the crow's foot indicates a maximum cardinality of one.

During the implementation phase of developing a database system,the data model is transformed into a database design.

Given only the following excerpt of an E-R model: Which of the following is known to be true?

Maximum cardinality indicates whether or not an instance of one entity class must be related to at least one instance of another entity class.

Which of the following is true about identifiers of entities?

During the design phase of developing a database system,the users are asked about the need for changes to existing forms and reports.

An entity that must logically depend on another entity is called a(n)________ entity.

It is possible for an entity to have a relationship to itself.