Relational Data Model and Constraints Quiz
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Questions and Answers

In the relational model, what are the data elements in each row called?

  • Tuples (correct)
  • Attributes
  • Rows
  • Columns

    • What is the key of a relation in the context of a table?

  • Sequential number
  • Column header
  • Attribute name
  • Value that uniquely identifies a row (correct)

    • What is the concept that gives an indication of the meaning of the data items in a column?

  • Column header or Attribute (correct)
  • Rows
  • Relations
  • Tuples

    • What do the data elements in each row of a relational model represent?

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

    In the context of a table, what is the key that uniquely identifies each row?

    <p>Primary Key</p> Signup and view all the answers

    What is the formal term for the column header that gives an indication of the meaning of the data items in that column?

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

    What are sometimes assigned as keys to identify the rows in a table, besides the actual data values?

    <p>Row-ids or sequential numbers</p> Signup and view all the answers

    In the context of a table, what is sometimes assigned as keys to identify the rows and is called an artificial key or surrogate key?

    <p>Primary Key</p> Signup and view all the answers

    What does EER stand for in the context of database modeling?

    <p>Enhanced Entity-Relationship</p> Signup and view all the answers

    What are some of the additional concepts included in the EER model?

    <p>Subclasses/superclasses</p> Signup and view all the answers

    How does EER extend ER diagrams to represent additional subgroupings of entities?

    <p>By using subclasses or subtypes</p> Signup and view all the answers

    What are some fundamental concepts used in conceptual modeling with the EER model?

    <p>Categories (UNION types)</p> Signup and view all the answers

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