Normalización de Bases de Datos
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Questions and Answers

Cal é o propósito da normalización en bases de datos?

  • Facilitar o acceso a datos non estruturados.
  • Reducir o tempo de resposta das consultas.
  • Aumentar a complexidade dos datos.
  • Eliminar duplicados e inconsistencias. (correct)

    • Que significa a 1FN na normalización?

  • Agrupar datos relacionados en unha única táboa.
  • Requerir a existencia de chaves primarias.
  • Eliminar todas as dependencias funcionais.
  • Asegurar que todos os valores son atómicos. (correct)

    • Cales son as fases da normalización?

  • 1NF, 2NF, 5NF.
  • 1FN, 3FN, 4FN.
  • 1FN, 2FN, 4FN.
  • 1FN, 2FN, 3FN. (correct)

    • A que se refire a 2FN na normalización?

    <p>Asegurar que non existan dependencias parciais.</p> Signup and view all the answers

    Cual das seguintes afirmacións é incorrecta sobre a 3FN?

    <p>Permite a existencia de colas xeradas automáticamente.</p> Signup and view all the answers

    Que tipo de datos se busca evitar na normalización?

    <p>Datos redundantes.</p> Signup and view all the answers

    Cales son as consecuencias dunha mala normalización?

    <p>Dificultades para manter a integridade dos datos.</p> Signup and view all the answers

    Cal é a principal vantaxe da normalización?

    <p>Mellora a integridade e consistencia dos datos.</p> Signup and view all the answers

    Study Notes

    Database Normalization

    • The video tutorial covers database normalization, specifically focusing on the process of transforming a single table into multiple inter-related tables.
    • The process involves creating an Entity-Relationship (E-R) diagram and converting it to a relational model, implementing the first, second, and third normal forms (1FN, 2FN, 3FN).
    • A practice exercise, involving a database for a student management system, is utilized.
    • The exercise includes requirements for entities like students, their associated languages, and academic work (PACs).
    • Several tables are then created, each fulfilling specific normalization requirements.
    • The 1FN, 2FN, and 3FN processes are applied in steps to eliminate dependencies and ensure data integrity.
    • Key tables and relationships within the database for the project demonstrate relationships between entities.

    Questions on Normalization

    • Questions asked include: the ability to determine an E-R model from a description of a system; the determination of the number of entities; the determination of the relationship between entities; whether a specific attribute (like the date of an assignment) is a key field within a table; and whether another attribute is a separate entity.

    Database Concepts

    • The video defines and details the components of a database, including tables and data types.
    • It examines database design principles (1FN, 2FN, 3FN).
    • The use and different implementations of database query languages are illustrated.

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    Related Documents

    Videotutorial 5 Bases de Datos PDF

    Description

    Este cuestionario explora a normalización de bases de datos, centrándose na transformación de táboas e na creación de modelos de relación. Os estudantes aprenderán sobre o diagrama de Entidade-Relación e como aplicar as formas normais 1FN, 2FN e 3FN. Inclúe un exercicio práctico relacionado cun sistema de xestión de estudantes.

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