'Candidate keys' presentation slideshows

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Relational Model

Relational Model. Outline. Relational Model Concepts Relational Model Constraints & Relational Database Schemas Update Operation & Dealing with Constraint Violations. Relational Model Concept.

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Chapter 3.6-7

Chapter 3.6-7. Normalization of Database Tables. Normalization. Normalization is process for assigning attributes to entities Reduces data redundancies Helps eliminate data anomalies Produces controlled redundancies to link tables Normalization stages 1NF - First normal form

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Relational Model

Indra Budi indra@cs.ui.ac.id. Relational Model. Essentials of Relational Approach. The Relational Model of Data is Based on the Concept of Relations A Relation is a Mathematical Concept Based on the Concept of Sets. Relations.

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CMSC424: Database Design

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Foundations of Database Systems

Foundations of Database Systems. ER and Database Designs Instructor: Zhijun Wang. Announcements. Quiz #1 will be given in the last hour of the class Assignment 1 is due today. Keys. Candidate keys Primary keys Foreign keys. An example.

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Essentials of Systems Analysis and Design Second Edition Joseph S. Valacich Joey F. George Jeffrey A. Hoffer

Essentials of Systems Analysis and Design Second Edition Joseph S. Valacich Joey F. George Jeffrey A. Hoffer. Chapter 7 Structuring System Requirements: Conceptual Data Modeling. 6.1. Learning Objectives. Ask the right kinds of questions to determine data requirements for an IS

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CS 405G: Introduction to Database Systems

CS 405G: Introduction to Database Systems. 25 Exercise Chen Qian University of Kentucky. Project presentation. Demonstrate all functionalities of your application Complete some requests Introduce any additional features. The bonus part, if you have completed it. 4/24 Thursday.

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C20.0046: Database Management Systems Lecture #3

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Multi-valued Dependencies and Fourth Normal Form

Multi-valued Dependencies and Fourth Normal Form. COSC 6340. Topics Covered. Definition of Multivalued Dependencies Reasoning about MVDs Fourth Normal Form. Motivation. There are schemas that are in BCNF that do not seem to be sufficiently normalized. Stars. name. street. city. title.

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Normalisation

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ECIS466: Database Management LOGICAL DESIGN

ECIS466: Database Management LOGICAL DESIGN. Traditional Systems Development Lifecycle. Planning. Analysis. Logical Design. Physical Design. Implementation. Steps in Logical Database Design. Conceptual Data Model. Represent entities as relations. Represent relationships as relations.

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Normalization and Other Data Modeling Methods

Normalization and Other Data Modeling Methods. There are many paths to the top of the mountain but the view is always the same Chinese proverb. Normalization. An alternative database design tool to data modeling A theoretical foundation for the relational model

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Database Management Fall 2003 Normalization Chapter 8

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Boyce-Codd NF

Boyce-Codd NF. Takahiko Saito Spring 2005 CS 157A. Purpose of Normalization. To reduce the chances for anomalies to occur in a database.

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Database

Database . Normalization. 7. Normal Forms. Unnormalized data. 1NF. 2NF. 3NF. BCNF. 4NF. 5NF (PJNF)?. DKNF. Normalized data. Steps in normalization . Remove. Table with repeating groups. Repeating Groups. 1 st Normal Form. Partial Dependencies. 2 nd Normal Form.

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Candidate Keys

Candidate Keys. Objectives of the Lecture :. To consider Integrity Constraints; To consider the principles of Candidate Keys; To consider Candidate Keys in SQL. What are Integrity Constraints ?.

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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 ?.

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