DCIT 55 – Reviewer: ER Model and Database Concepts
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Questions and Answers

What kind of join is applicable if any other comparison operator is used?

  • Equijoin
  • Theta join (correct)
  • Natural join
  • Implicit join

    • Which relational operator yields only the rows that appear in both tables?

  • Difference
  • Equijoin
  • Intersect (correct)
  • Union

    • What is an attribute that uniquely identifies any given entity?

  • Super key
  • Secondary key
  • Primary key (correct)
  • Composite key

    • What command marks and saves the current point in the processing of a transaction?

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

    Which term best describes the collection of interrelated data?

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

    What yields all rows in one table not found in the other table?

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

    What type of database supports data located at a single site?

    <p>Centralized database</p> Signup and view all the answers

    What does DML stand for in the context of database management systems?

    <p>Data Manipulation Language</p> Signup and view all the answers

    Which of the following is NOT a type of database anomaly?

    <p>Retrieval anomaly</p> Signup and view all the answers

    Which attribute can have many values?

    <p>Multivalued attribute</p> Signup and view all the answers

    What is a candidate key?

    <p>A super key without redundancies</p> Signup and view all the answers

    What type of database supports only one user at a time?

    <p>Single-user database</p> Signup and view all the answers

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