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INF2603 Ch3 – Data Models – True / False

A data model is usually graphical.
True
The terms data model and database model are often used interchangeably.
True
An implementation-ready data model should contain a description of the data structure that will store the end-user data.
True
Within the database environment, a data model represents data structures with the purpose of supporting a specific problem domain.
True
Data modeling starts with a very complex representation, and as knowledge of the problem is gained, the model is simplified.
False
A manager and a programmer usually have the same view of the same data.
False
Database designers determine the data and information that yield the required understanding of the entire business.
False
Business rules apply to businesses and government groups, but not to other types of organizations such as religious groups or research laboratories.
False
Business rules must be rendered in writing.
True
In an SQL-based relational database, each table is dependent on another.
False
In an SQL-based relational database, rows in different tables are related based on common values in common attributes.
True
End-user interfaces require the end user to manually generate SQL code.
False
Each row in the relational table is known as an entity instance or entity occurrence in the ER model.
True
In Chen notation, entities and relationships must be oriented horizontally.
False
M:N relationships are not appropriate in a relational model.
True
Today, most relational database products can be classified as object/relational.
True
The network model has structural level dependence.
True
The entity relationship model is limited to conceptual modeling, with no implementation component.
True
The hierarchical model is software-independent.
False
The relational model is hardware-dependent and software-independent.
False

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