Database Systems and Data Modeling

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Questions and Answers

What is the primary purpose of a data model in database design?

To facilitate interaction among the designer, the applications programmer, and the end user (correct)
To define the business rules of an organization
To optimize database performance
To create a physical representation of the database

What type of relationship is described when one instance of entity A is associated with multiple instances of entity B?

Many-to-one (M:1) relationship
Many-to-many (M:N or M:M) relationship
One-to-many (1:M) relationship (correct)
One-to-one (1:1) relationship

What is the primary source of business rules in an organization?

Direct interviews with end users
Policy makers
Written documentation (correct)
Department managers

How do nouns translate into data model components?

Into entities (D) Signup and view all the answers

What is the primary benefit of using data abstraction in data modeling?

Reduced data complexity (A) Signup and view all the answers

What is the primary purpose of a conceptual schema in a data model?

To provide a global view of the entire database, independent of software and hardware (B) Signup and view all the answers

What is the primary advantage of using an Entity-Relationship Diagram (ERD) in data modeling?

To graphically model database components and their relationships (A) Signup and view all the answers

What is the primary characteristic of a relational data model?

It represents data as a collection of related entities, with each entity described by a set of attributes (A) Signup and view all the answers

What is the purpose of the external model in a data model?

To provide a specific representation of an external view of the database, tailored to a particular business unit’s operations (B) Signup and view all the answers