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Schema Refinement and Normal Forms

Schema Refinement and Normal Forms

Schema Refinement and Normal Forms. Chapter 19. The Evils of Redundancy. Redundancy is at the root of several problems associated with relational schemas: redundant storage, insert/delete/update anomalies

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1.07k views • 50 slides
Schema Refinement and Normal Forms

Schema Refinement and Normal Forms

Schema Refinement and Normal Forms. courtesy of Joe Hellerstein for some slides. Jianlin Feng School of Software SUN YAT-SEN UNIVERSITY. Review: Database Design. Requirements Analysis user needs; what must database do? Conceptual Design high level description (often done with ER model)

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578 views • 45 slides
Schema Refinement and Normal Forms

Schema Refinement and Normal Forms

Schema Refinement and Normal Forms. courtesy of Joe Hellerstein for some slides. Jianlin Feng School of Software SUN YAT-SEN UNIVERSITY. Review: Database Design. Requirements Analysis user needs; what must database do? Conceptual Design high level description (often done with ER model)

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549 views • 45 slides
Functional Dependencies and Normalization

Functional Dependencies and Normalization

Functional Dependencies and Normalization. R&G Chapter 19 Lectures 25 & 26. Science is the knowledge of consequences, and dependence of one fact upon another. Thomas Hobbes (1588-1679 ). Administrivia. Homework 5 available by Thursday Final exam 4 weeks from tomorrow.

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956 views • 44 slides
C20.0046: Database Management Systems Lecture #5

C20.0046: Database Management Systems Lecture #5

C20.0046: Database Management Systems Lecture #5. Matthew P. Johnson Stern School of Business, NYU Spring, 2004. Agenda. Last time: relational model Homework 1 is up, due next Tuesday This time: Functional dependencies Keys and superkeys in terms of FDs Finding keys for relations

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555 views • 43 slides

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