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CS107 Module 2.1 Relational Database Models Quiz

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Questions and Answers

What is a primary key in a relational database?

A field that serves as a foreign key in another table
A field that serves as the unique identifier of a specific tuple in a relation (correct)
A field that can have duplicate values within a relation
A field that stores only numeric values

How does a foreign key relate to a primary key in a relational database?

Foreign key is always a text field
Foreign key values must match values of the primary key in another table (correct)
Foreign key is the same as the primary key
Foreign key can have NULL values

What is the main purpose of normalization in a relational database?

To increase the number of fields in each table
To add redundancy to the data for faster retrieval
To minimize errors and redundancy by structuring tables efficiently (correct)
To structure tables inefficiently

In a relational database, what is a domain?

A set of legal values for an attribute (B) Signup and view all the answers

Which of the following best describes an attribute in a relational database model?

It represents the fields within a specific relation or table (B) Signup and view all the answers

What characteristic does data integrity encompass in a relational database?

Completeness, timeliness, accuracy, and authorization (D) Signup and view all the answers

What is the purpose of data validation in a relational database?

Ensuring proper data format and values (A) Signup and view all the answers

What is the role of constraints in a relational database?

Enforcing data integrity rules (C) Signup and view all the answers

Why is it important for every table to have a primary key in a relational database?

To uniquely identify each record in the table (B) Signup and view all the answers

What does the referential integrity constraint ensure in a relational database?

Foreign key values match primary key values (A) Signup and view all the answers

Which relational operation involves combining data from multiple tables based on relationships?

Join (D) Signup and view all the answers

What is the role of Standardized Query Language in data management?

Empowering users beyond programmers to access and manipulate data (D) Signup and view all the answers

What is the benefit of data independence in a relational database model?

Separating logical structure from physical storage (B) Signup and view all the answers

In relational databases, what does ensuring Data Integrity involve?

Guaranteeing accurate and consistent data through well-defined structures and rules (A) Signup and view all the answers

Which of the following is NOT an example of a real-world application of relational databases mentioned in the text?

Handling inventory data for manufacturing companies (C) Signup and view all the answers

What is a key benefit of understanding the core concepts of the relational model?

Empowering efficient and reliable database design (D) Signup and view all the answers

How does the text emphasize the importance of practice in relation to relational databases?

It highlights that practice plays a key role in mastering relational databases (A) Signup and view all the answers

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