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?

    <p>A set of legal values for an attribute</p> Signup and view all the answers

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

    <p>It represents the fields within a specific relation or table</p> Signup and view all the answers

    What characteristic does data integrity encompass in a relational database?

    <p>Completeness, timeliness, accuracy, and authorization</p> Signup and view all the answers

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

    <p>Ensuring proper data format and values</p> Signup and view all the answers

    What is the role of constraints in a relational database?

    <p>Enforcing data integrity rules</p> Signup and view all the answers

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

    <p>To uniquely identify each record in the table</p> Signup and view all the answers

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

    <p>Foreign key values match primary key values</p> Signup and view all the answers

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

    <p>Join</p> Signup and view all the answers

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

    <p>Empowering users beyond programmers to access and manipulate data</p> Signup and view all the answers

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

    <p>Separating logical structure from physical storage</p> Signup and view all the answers

    In relational databases, what does ensuring Data Integrity involve?

    <p>Guaranteeing accurate and consistent data through well-defined structures and rules</p> 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?

    <p>Handling inventory data for manufacturing companies</p> Signup and view all the answers

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

    <p>Empowering efficient and reliable database design</p> Signup and view all the answers

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

    <p>It highlights that practice plays a key role in mastering relational databases</p> Signup and view all the answers

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