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Exam 2: Data Models

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Question 21

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Students and classes have a relationship.

A) one-to-one
B) one-to-many
C) many-to-one
D) many-to-many

E) A) and C)
F) C) and D)

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Question 22

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The term is used to refer to the task of creating a conceptual data model that could be implemented in any DBMS.

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Question 23

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A(n)in a hierarchical model is the equivalent of a record in a file system.

A noun in a business rule translates to a(n) in the data model.

An internal refers to a specific representation of an internal model,using the database constructs supported by the chosen database.

Which of the following types of HDFS nodes stores all the metadata about a file system?

An implementation-ready data model needn't necessarily contain enforceable rules to guarantee the integrity of the data.

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

The external model is the representation of the database as "seen" by the DBMS.

The model uses the term connectivity to label the relationship types.

What do business rules require to be effective?

A(n)is a collection of similar objects with a shared structure and behavior.

Within the database environment,a data model represents data structures with the purpose of supporting a specific problem domain.

A(n) is a restriction placed on the data.

In the context of data models,an entity is a person,place,thing,or event about which data will be collected and stored.

The relational model is hardware-dependent and software-independent.

A(n)is a relatively simple representation of more complex real-world data structures.

In an SQL-based relational database,rows in different tables are related based on common values in common attributes.

The hierarchical model is software-independent.

The network model has structural level dependence.