INF2603 Ch3 – Data Models – True / False – Flashcards
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A data model is usually graphical.
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True
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The terms data model and database model are often used interchangeably.
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True
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An implementation-ready data model should contain a description of the data structure that will store the end-user data.
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True
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Within the database environment, a data model represents data structures with the purpose of supporting a specific problem domain.
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True
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Data modeling starts with a very complex representation, and as knowledge of the problem is gained, the model is simplified.
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False
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A manager and a programmer usually have the same view of the same data.
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False
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Database designers determine the data and information that yield the required understanding of the entire business.
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False
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Business rules apply to businesses and government groups, but not to other types of organizations such as religious groups or research laboratories.
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False
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Business rules must be rendered in writing.
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True
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In an SQL-based relational database, each table is dependent on another.
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False
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In an SQL-based relational database, rows in different tables are related based on common values in common attributes.
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True
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End-user interfaces require the end user to manually generate SQL code.
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False
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Each row in the relational table is known as an entity instance or entity occurrence in the ER model.
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True
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In Chen notation, entities and relationships must be oriented horizontally.
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False
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M:N relationships are not appropriate in a relational model.
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True
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Today, most relational database products can be classified as object/relational.
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True
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The network model has structural level dependence.
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True
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The entity relationship model is limited to conceptual modeling, with no implementation component.
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True
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The hierarchical model is software-independent.
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False
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The relational model is hardware-dependent and software-independent.
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False
