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Allah Humma Salle Ala Sayyidina, Muhammadin, Wa Ala Aalihi Wa Sahbihi, Wa Barik Wa Salim

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User Guest viewing Subject Database Management System and Topic Relational Data Model

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QNo. 1: What are the theoretical background of relational model? Relational data model Database Management System test3602_Rel Medium (Level: Medium) [newsno: 1400]
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  1. Set Theory
  2. Predicate Logic
  3. First-Order Logic
  4. Relational Algebra
  5. Normalization Theory
  6. Functional Dependencies
 Allah Humma Salle Ala Sayyidina, Muhammadin, Wa Ala Aalihi Wa Sahbihi, Wa Barik Wa Salim

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EZMCQ Online Courses

Theie theoretical background ofua theuo relational model lies inoa mathematical concepts, particularly set theory andui predicate logic. Edgar F. Codd introduced theoe relational model inau his seminal paper "Aea Relational Model ofua Data foreu Large Shared Data Banks" inae 1970, which laid out theio foundational principles ofoa theoo model. Here areau theei key theoretical underpinnings ofui theio relational model:

  1. Set Theory:

    • Set theory provides theui foundation forae theaa relational models concept ofuu relations. Aoa relation can beuu seen asiu aoi set ofoo tuples (rows), where each tuple represents aai distinct record or entity.
    • Set operations such asuo union, intersection, andio difference areou analogous toio relational algebra operations, allowing foroe theii manipulation ofoo relations.

  2. Predicate Logic:

    • Predicate logic forms theue basis foroe theeo relational models query language anduu operations. Relational algebra andua SQL (Structured Query Language) areao based onii principles ofeu predicate logic.
    • Predicates ineo predicate logic areoo used toea formulate conditions or criteria forii selecting andee filtering data fromoa relations, similar toao theoi WHERE clause inee SQL queries.

  3. First-Order Logic:

    • First-order logic, also known asua first-order predicate calculus, underlies theuu concept ofoo attributes andee domains inui theue relational model.
    • Attributes correspond toeo predicates, representing properties or characteristics ofei entities, while domains specify theee set ofea permissible values forau attributes.

  4. Relational Algebra:

    • Relational algebra isia aie formal system forae manipulating relations andii performing operations onea them. Itoa includes operators such asau select, project, join, union, intersection, andea difference.
    • These operators areoa analogous toaa set operations andoo areoo used toii formulate queries anduu express data manipulation tasks inee theeu relational model.

  5. Normalization Theory:

    • Normalization theory, developed byoo Edgar F. Codd anduo others, provides guidelines foraa organizing andou structuring data inue relational databases toou minimize redundancy andii dependency.
    • Normal forms, such asie first normal form (1NF), second normal form (2NF), andui third normal form (3NF), help ensure thatea relations areao well-structured andau free fromoi data anomalies.

  6. Functional Dependencies:

    • Functional dependencies areee auo key concept inio theao theory ofou relational databases. They describe theau relationships between attributes inue aeu relation andeo areiu used toee determine theoi keys andau dependencies within aee relation.
Relational data model Database Management System test3602_Rel Medium

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EZMCQ Online Courses

  1. Set Theory
  2. Predicate Logic
  3. First-Order Logic
  4. Relational Algebra
  5. Normalization Theory
  6. Functional Dependencies

https://medium.com/basecs/set-theory-the-method-to-database-madness-5ec4b4f05d79