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Database Design: Relationships and Entities

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Database Design: Relationships and Entities

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Questions and Answers

What is the primary function of a foreign key in a database table?

To define the physical structure of the database
To establish a relationship between two tables (correct)
To describe the attributes of an entity
To uniquely identify each record in a table

Which of the following is an example of an entity attribute?

Database
Student
Email (correct)
Teaches

What is the term for the associations between entities in a database?

Relationships (correct)
Cardinality
Entities
Attributes

What type of model is used to represent the physical structure of a database?

Physical data model (A) Signup and view all the answers

Which of the following is a characteristic of a primary key?

It remains a primary key in the original table (C) Signup and view all the answers

What is the purpose of Crow's Foot Symbols in database modeling?

To represent relationships (D) Signup and view all the answers

What is the primary purpose of an Entity Relationship Diagram (ERD)?

To describe an overall design concisely yet accurately (D) Signup and view all the answers

What is an instance of an entity in a database?

A record or a row in a table (C) Signup and view all the answers

What is a primary key in a database table?

A set of attributes that uniquely identifies an instance of the entity (C) Signup and view all the answers

What is the purpose of a foreign key in a database?

To link two tables together (C) Signup and view all the answers

What is the primary focus of the Conceptual Data Model?

To establish the entities and their relationships (D) Signup and view all the answers

What type of relationship is typically represented in a Conceptual ERD?

Many-to-many (C) Signup and view all the answers

What is an example of an entity in a database?

A course (A) Signup and view all the answers

What is an attribute in a database?

A fact or description of an entity (B) Signup and view all the answers

Which of the following is NOT a characteristic of a Conceptual ERD?

It defines the physical database structure (C) Signup and view all the answers

What is the main purpose of a Logical ERD?

To establish the physical database structure (A) Signup and view all the answers

Which of the following levels of abstraction is NOT typically drawn in an ER model?

Implementation ERD (D) Signup and view all the answers

What is the main difference between the three levels of an ER model?

The purposes they are created for and the audiences they are meant to target (C) Signup and view all the answers