DCIT 55 - ER Model Concepts Review
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Questions and Answers

Which concept is best described as 'a collection of interrelated data'?

  • Relational Model
  • Data Dictionary
  • Database (correct)
  • Relational Algebra

    • Which concept defines the theoretical way of manipulating table contents using relational operators?

  • Database
  • Data Dictionary
  • Relational Algebra (correct)
  • Relational Model

    • Which concept is best described as 'enabling programmers to view data logically rather than physically'?

  • Relational Model (correct)
  • Data Dictionary
  • Database
  • Relational Algebra

    • Which concept provides a detailed accounting of all tables found within the user/designer-created database?

    <p>Data Dictionary (C)</p> Signup and view all the answers

    Which concept is best described as 'the characteristics of entities'?

    <p>Attributes (C)</p> Signup and view all the answers

    Which concept is best described as 'an entity that can exist apart from one or more related entities'?

    <p>Existence independence (C)</p> Signup and view all the answers

    Which of the following best describes a Multivalued Attribute in a database?

    <p>An attribute that can have many values and nulls (B)</p> Signup and view all the answers

    Which of the following is true about a Single-user database?

    <p>It supports only one user at a time (B)</p> Signup and view all the answers

    What is the definition of an Existence Dependence in a database?

    <p>It exists in the database only when it is associated with another related entity occurrence (C)</p> Signup and view all the answers

    What type of anomaly is an Update anomaly?

    <p>It is a type of anomaly that occurs when changing records (C)</p> Signup and view all the answers

    What is the purpose of a Data Manipulation Language (DML) in a database?

    <p>It is used to manipulate data in a database (D)</p> Signup and view all the answers

    What type of anomaly occurs when entering new records?

    <p>Insertion anomalies (C)</p> Signup and view all the answers

    What is the definition of a Candidate Key in a database?

    <p>It is a superkey without redundancies (A)</p> Signup and view all the answers

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

    <p>To uniquely identify each row (A)</p> Signup and view all the answers

    What does the ROLLBACK command do in a database transaction?

    <p>Undoes any changes made during the transaction (D)</p> Signup and view all the answers

    What is the main function of a Foreign key in a database relationship?

    <p>To match primary key values in related tables (D)</p> Signup and view all the answers

    What does a Multi-user database support at the same time?

    <p>Multiple users accessing the database concurrently (D)</p> Signup and view all the answers

    In which type of join are unmatched values in one table left null?

    <p>Outer join (D)</p> Signup and view all the answers

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