Recent Lessons

Show all results for ""

Feature Overview

Ace your exams with our all-in-one platform for creating and sharing quizzes and tests.

Quizzes

Create quizzes and tests automatically from your content using AI.

Flashcards

Automatically turn your notes into digital flashcards.

Share, Export & Embed

Share with classmates or export to Excel and your learning management system.

Stats & Reporting

Auto-grading quizzes and tests with detailed stats and reports.

Mobile Apps

The smarter way to study – wherever you are.

Pricing

Search...

12 Questions

1 Views

Entity-Relationship (E-R) Model

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the main purpose of the Entity-Relationship Model (ER Model)?

To store and manage user interface data

To visualize database records

To perform complex data calculations

To represent the structure and relationships of entities within a system (correct)

In the Entity-Relationship Model (ER Model), what are entities?

Data manipulation techniques

Storage units for database information

Objects or concepts within a system worth storing data about (correct)

Database administrators

What are attributes in the context of the Entity-Relationship Model (ER Model)?

Properties or characteristics of an entity (correct)

Data storage formats

Database server locations

User interface design elements

Why are primary keys important in the context of entities?

They uniquely identify each entity Signup and view all the answers

What do relationships establish in the Entity-Relationship Model (ER Model)?

Connections between entities Signup and view all the answers

What benefits does the Entity-Relationship Model (ER Model) offer?

Improved data organization, enhanced data integrity, efficient database design, and simplified database maintenance. Signup and view all the answers

What do Entity Relationship Diagrams (ER Diagrams) use to represent entities?

Rectangles Signup and view all the answers

In Entity Relationship Model, what does cardinality refer to?

Number of occurrences or instances of one entity that are associated with the occurrences of another entity Signup and view all the answers

Which symbol represents a basic entity in ER Diagrams?

Rectangle Signup and view all the answers

What does a weak entity inherit in the Entity Relationship Model?

Identifier of its parent entity Signup and view all the answers

How are multi-valued attributes represented in ER Diagrams?

Double oval Signup and view all the answers

What is the purpose of derived attributes in ER Diagrams?

Logically derived from any other attribute Signup and view all the answers