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Relational Algebra in Database Management
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Relational Algebra in Database Management

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Questions and Answers

What is the primary function of the SELECT operation in relational algebra?

  • To add new columns to a relation
  • To combine two relations into a single relation
  • To select a subset of tuples from a relation based on a condition (correct)
  • To eliminate duplicate tuples from a relation
  • What is the result of the PROJECT operation in relational algebra?

  • A set of distinct tuples with selected columns (correct)
  • A relation with all columns and duplicate tuples
  • A multiset of tuples with duplicate columns
  • A relation with all columns and no duplicate tuples
  • What is the property of the SELECT operation that allows multiple operations to be combined into a single operation?

  • Associativity
  • Commutativity (correct)
  • Selectivity
  • Distributivity
  • What is the term used to describe the fraction of tuples selected by a selection condition in relational algebra?

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

    What is the purpose of relational algebra in the relational model?

    <p>To define a set of operations for manipulating data</p> Signup and view all the answers

    What is the term used to describe a sequence of relational algebra operations?

    <p>Relational algebra expression</p> Signup and view all the answers

    The PROJECT operation is commutative.

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

    The SELECT operation can be used to deselect columns from a table.

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

    A relational algebra expression can consist of a sequence of unary and binary operations.

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

    The term 'degree' refers to the number of tuples in a relation.

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

    The DIVISION operation is a unary relational operation.

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

    Relational algebra provides a basic set of operations for the relational model.

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

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