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Database Systems Chapter 2: Data Models

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Questions and Answers

What is the primary purpose of data modeling in database design?

To enforce business rules and constraints on the data
To create a visual representation of complex real-world data structures
To develop a detailed and comprehensive database schema
To facilitate communication among designers, programmers, and end users (correct)

What is the characteristic of an entity in a data model?

A graphical representation of complex real-world data
A constraint on the data to ensure data integrity
A relationship between two or more entities
An attribute of an entity (correct)

What is the primary benefit of translating business rules into data model components?

To reduce the complexity of database design
To improve data security and access control
To allow designers to understand the nature, role, and scope of data (correct)
To ensure data consistency and integrity

What is the type of relationship that describes an association between two entities, where one instance of entity A is related to multiple instances of entity B?

One-to-many (1:M) relationship (C) Signup and view all the answers

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

All of the above (D) Signup and view all the answers

What is the primary goal of a data model in representing a complex real-world data environment?

To provide a conceptual representation of the real-world data environment (D) Signup and view all the answers

Which data model is based on the concept of objects and classes, and is the basis for object-oriented database management systems?

Object-oriented data model (C) Signup and view all the answers

What is the primary characteristic of the external data model?

It represents the end-user's view of the data environment (B) Signup and view all the answers

Which of the following is a characteristic of the conceptual data model?

It is independent of both software and hardware (D) Signup and view all the answers

What is the primary purpose of the entity-relationship diagram (ERD)?

To provide a graphical representation of entities, attributes, and relationships (B) Signup and view all the answers

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