Exam 2: Data Models

The hierarchical model is software-independent.

Students and classes have a relationship.

The model was developed to allow designers to use a graphical tool to examine structures rather than describing them with text.

Each row in the relational table is known as an entity instance or entity occurrence in the ER model.

What do business rules require to be effective?

VMS/VSAM is an example of the .

An implementation-ready data model should contain a description of the data structure that will store the end-user data.

NoSQL databases:

Which of the following is a disadvantage of the hierarchical data model?

A(n) represents a particular type of object in the real world.

The model is the end users' view of the data environment.

A(n) is anything about which data are to be collected and stored.

The data model is said to be a semantic data model.

From a database point of view, the collection of data becomes meaningful only when it reflects properly defined_____.

A(n) is bidirectional.

In an SQL-based relational database, each table is dependent on every other table.

Each row in a relation is called a(n) .

One of the limitations of the model is that there is a lack of standards.

Business rules apply to businesses and government groups, but not to other types of organizations such as religious groups or research laboratories.

In object-oriented terms, a(n) defines an object's behavior.