The History of the Relational Data Model Quiz
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The History of the Relational Data Model Quiz

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Questions and Answers

Which term refers to the total number of tuples or rows present in a relation?

  • Cardinality (correct)
  • Relation state
  • Relational database schema
  • Degree

    • What does a relational database schema consist of?

  • Tuples and rows
  • Relation states and relation instances
  • Relation schemas and integrity constraints (correct)
  • Relation states and integrity constraints

    • What is a relation instance or relation state?

  • The set of integrity constraints in a database
  • A set of tuples at a given moment of time (correct)
  • A collection of relation schemas
  • The total number of tuples or rows in a relation

    • Which company first implemented the relational model commercially?

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

    Who is credited with inventing the relational data model?

    <p>Ted Codd</p> Signup and view all the answers

    What is a tuple in the context of a relational database?

    <p>A row</p> Signup and view all the answers

    What is the degree or arity of a relation?

    <p>The number of attributes in a relation schema</p> Signup and view all the answers

    The degree of this relation student is ______

    <p>6</p> Signup and view all the answers

    The cardinality of this student relation is ______

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

    A relational database schema is a set of ______ and a set of integrity constraints

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

    Ted Cord invented the ______ data model in 1970

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

    The first commercial implementations of the relational model were by ______ and IBM

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

    A ______ is a set of possible values that you can input for an attribute

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

    A relation schema is made up of a relation name and a list of ______

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

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