ITE305 Chapter 2: Data Models and Data Modeling

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

To design the database schema

To create a complex representation of real-world data structures

To serve as a bridge between real-world objects and the computer database (correct)

To implement the database system

What is a characteristic of the data modeling process?

It is an iterative, progressive process (correct)

It is a non-iterative process

It is a reverse engineering process

It is a one-time activity

What is an entity in the context of data modeling?

A graphical representation of a database component

Anything about which data will be collected and stored (correct)

A constraint on a database table

A relationship between two objects

What is the primary tool used to represent data models?

Entity Relationship Diagram (ERD) Signup and view all the answers

What is the purpose of a data model?

To create a blueprint of the database Signup and view all the answers

What are the basic building blocks of all data models?

Entities, attributes, relationships, and constraints Signup and view all the answers

What is an entity instance in data modeling?

A specific occurrence of an entity Signup and view all the answers

What type of relationship exists between a painter and their paintings?

One-to-many Signup and view all the answers

What is the primary purpose of constraints in data modeling?

To ensure data integrity Signup and view all the answers

What is a business rule in data modeling?

A brief, precise, and unambiguous description of a policy or procedure Signup and view all the answers

How do you properly identify entities, attributes, relationships, and constraints in data modeling?

By clearly identifying the business rules for the problem domain Signup and view all the answers

What is an example of a one-to-one relationship in data modeling?

A retail company’s management structure requiring a single employee to manage each store Signup and view all the answers

What is the relationship between a customer and an agent according to the given example?

A customer can be served by only one agent Signup and view all the answers

What is the primary source of business rules according to the text?

Direct interviews with end users Signup and view all the answers

How do verbs translate into data model components?

Into relationships among entities Signup and view all the answers

What is the purpose of asking two questions when identifying the type of relationship?

To determine the bidirectional nature of the relationship Signup and view all the answers

What is the naming convention for attributes in a data model?

Prefixing the attribute name with the entity name Signup and view all the answers

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

To understand the problem domain Signup and view all the answers