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Databases Illuminated

Databases Illuminated

Databases Illuminated. Chapter 6 Normalization. Objectives of Normalization. Develop a good description of the data, its relationships and constraints Produce a stable set of relations that Is a faithful model of the enterprise Is highly flexible

By brac
(116 views)

Chapter 7: Relational Database Design

Chapter 7: Relational Database Design

CS157B. Lecture 7 Multivalued Dependency. Chapter 7: Relational Database Design. Refining an ER Diagram Given the F.D.s: sid  dname and dname  dhead Is the following a good design ?. sid. dhead. since. dname. MAJOR_IN. sname. STUDENT. DEPARTMENT. doffice.

By lael
(158 views)

Normalization

Normalization

Normalization. What is normalization ?. Proposed by Codd in 1972 Takes a relation through a series of steps to certify whether it satisfies a certain normal form Initially Codd proposed three normal forms Boyce- Codd normal form is introduced by Boyce and Codd

By gay-torres
(231 views)


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Functional Dependency

Functional Dependency

Functional Dependency. Presenter Usman Saeed. Definition. Definition: constraints on relations() characteristic of an attribute where values are determined by another attribute’s values A  B if “for every valid instance of A, that value of A uniquely determines the value of B”

By diem (155 views)

Functional Dependency

Functional Dependency

Functional Dependency. Rajhdeep Jandir. Definition. A functional dependency is defined as a constraint between two sets of attributes in a relation from a database.

By pekelo (598 views)

Functional Dependency

Functional Dependency

Functional Dependency . Murat Kantarcioglu. Functional Dependencies . Let R be a relation schema   R and   R The functional dependency

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Functional Dependency

Functional Dependency

kma@ittelkom.ac.id. Functional Dependency. Overview. Basic Concepts. A constraint on the set of legal relations to express facts about the enterprise for modeling database. Require that the value for a certain set of attributes determines uniquely the value for another set of attributes.

By xyla-salinas (150 views)

Functional Dependency Grammars

Functional Dependency Grammars

Functional Dependency Grammars. Andreea Gagea ( cas . Macovei ) Faculty of Computer Science Iasi. Dependency Grammar . - dependency between grammatical units ; - Lucien Tesnière -1959; - the main aim: to parse natural language and generate tree banks ;

By mayes (288 views)

Tutorial 4: Functional Dependency

Tutorial 4: Functional Dependency

Tutorial 4: Functional Dependency. Question. Let R be a relation with schema { A , B , C , D , E }, on which the following functional dependencies hold: A  BC , CD  E , B  D , E  A . Compute the closure of CD. Also do we have B  E ?.

By Faraday (4841 views)

Keys and Functional Dependency

Keys and Functional Dependency

CS157A. Lecture 14. Keys and Functional Dependency. Prof. Sin-Min Lee Department of Computer Science San Jose State University. Data Normalization. Primarily a tool to validate and improve a logical design so that it satisfies certain constraints that avoid unnecessary duplication of data.

By maj (130 views)

Functional Dependency and Normalization

Functional Dependency and Normalization

Functional Dependency and Normalization. Informal design guidelines for relation schemas. Functional dependencies. Normal forms. Normalization. Informal Design Guidelines. Semantics of relations and attributes.

By odette-bird (181 views)

Tutorial 7 : Functional Dependency

Tutorial 7 : Functional Dependency

Tutorial 7 : Functional Dependency. Question 1. According to the tuples in the table below, indicate the functional dependencies in the right table that must be false. Solution 1. Question 2. Below is an instance of R(A1,A2,A3,A4). Choose the FD which may hold on R A4->A1 A2A3->A4

By azuka (274 views)