Logical Database Design and Relational Model Quiz
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Questions and Answers

Which of the following is a requirement for a table to qualify as a relation?

  • Having attributes with non-unique names (correct)
  • Having non-unique row values
  • Allowing multivalued attributes
  • Having non-unique attribute values

    • What is the primary characteristic of an attribute value in a relation?

  • It must be null
  • It must be multivalued
  • It can be composite
  • It must be atomic (correct)

    • What is the main purpose of candidate keys in a relation?

  • To ensure non-atomic attribute values
  • To allow duplicate rows
  • To uniquely identify rows (correct)
  • To create multivalued attributes

    • Which normal form deals with the problem of multivalued dependencies?

    <p>Third normal form (3NF)</p> Signup and view all the answers

    What does a unique table name contribute to a relation?

    <p>It ensures data integrity</p> Signup and view all the answers

    What are the properties of a relation in a database?

    <p>Unique name, atomic attribute values, unique rows, and unique column names</p> Signup and view all the answers

    Which normal form addresses the problem of multivalued dependencies in a relation?

    <p>First normal form</p> Signup and view all the answers

    What is the main purpose of candidate keys in a relation?

    <p>To uniquely identify each row in a relation</p> Signup and view all the answers

    What are the constraints for attributes in tables to qualify as a relation?

    <p>Atomic attribute values and unique rows</p> Signup and view all the answers

    Which component of the relational model ensures the integrity of manipulated data?

    <p>Data integrity mechanisms</p> Signup and view all the answers

    Which of the following is NOT a property of a relation in a database?

    <p>Every attribute value must be composite</p> Signup and view all the answers

    What is the primary characteristic of an attribute value in a relation?

    <p>It must be atomic</p> Signup and view all the answers

    What is the main purpose of candidate keys in a relation?

    <p>To uniquely identify each row in the table</p> Signup and view all the answers

    Which normal form addresses the problem of multivalued dependencies in a relation?

    <p>First normal form (1NF)</p> Signup and view all the answers

    What are the properties of a table to qualify as a relation in a database?

    <p>Ensuring unique table name and atomic attribute values</p> Signup and view all the answers

    Study Notes

    Requirements for a Relation

    • A table must have a unique table name to qualify as a relation.
    • The constraints for attributes in tables to qualify as a relation are:
      • Each row must be unique.
      • Each column must have a unique name.
      • All values in a column must be of the same data type.
      • Each value in a row must be a single value.

    Primary Characteristic of an Attribute Value

    • The primary characteristic of an attribute value in a relation is that it is atomic, meaning it cannot be divided into smaller parts.

    Purpose of Candidate Keys

    • The main purpose of candidate keys in a relation is to identify a unique row in a table.

    Normal Forms

    • The normal form that deals with the problem of multivalued dependencies is 4th normal form.
    • The normal form that addresses the problem of multivalued dependencies in a relation is also 4th normal form.

    Relational Model

    • The component of the relational model that ensures the integrity of manipulated data is constraints.

    Properties of a Relation

    • The properties of a relation in a database are:
      • Each row must be unique.
      • Each column must have a unique name.
      • All values in a column must be of the same data type.
      • Each value in a row must be a single value.
      • Each row has a unique combination of values.
      • No two rows have the same combination of values.

    Non-Property of a Relation

    • A relation in a database does not have a specific order of rows.

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    Description

    Test your knowledge on logical database design and the relational model with this quiz. The quiz covers topics such as relation properties, candidate keys, normal forms, merging relations, and transforming diagrams to relations.

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