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Data Normalization and Relational Model Quiz
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Data Normalization and Relational Model Quiz

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Questions and Answers

Which of the following is NOT a goal of data normalization?

  • To avoid duplication of data
  • To validate and improve a logical design
  • To decompose relations with anomalies
  • To allow users to insert, delete, and update rows (correct)

    • What is the purpose of well-structured relations?

  • To minimize data redundancy
  • To avoid anomalies (correct)
  • To produce smaller relations
  • To allow users to insert, delete, and update rows

    • What is an insertion anomaly?

  • Adding new rows causes data inconsistencies
  • Deleting rows may cause a loss of data needed for other future rows
  • Adding new rows forces user to create duplicate data (correct)
  • Changing data in a row forces changes to other rows

    • What is a deletion anomaly?

    <p>Deleting rows may cause a loss of data needed for other future rows</p> Signup and view all the answers

    What is a modification anomaly?

    <p>Changing data in a row forces changes to other rows</p> Signup and view all the answers

    Data normalization is primarily a tool to validate and improve a logical design so that it satisfies certain constraints that avoid unnecessary duplication of ______.

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

    The process of decomposing relations with anomalies to produce smaller, ______ relations.

    <p>well-structured</p> Signup and view all the answers

    A relation that contains minimal data redundancy and allows users to insert, delete, and update rows without causing ______ inconsistencies.

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

    The goal of well-structured relations is to avoid ______.

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

    Example – Figure 5.2b: Is this a ______?

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

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