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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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819 views • 70 slides
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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1.09k views • 50 slides
Schema Refinement and Normalization

Schema Refinement and Normalization

Schema Refinement and Normalization. Nobody realizes that some people expend tremendous energy merely to be normal. Albert Camus . Functional Dependencies (FDs) (Review). A functional dependency X ? Y holds over relation schema R if, for every allowable instance r of R:

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584 views • 26 slides
Functional Dependencies, BCNF and Normalization

Functional Dependencies, BCNF and Normalization

Functional Dependencies, BCNF and Normalization. Functional Dependencies (FDs). A functional dependency X Y holds over relation R if, for every allowable instance r of R: t1 r, t2 r, ( t1 ) = ( t2 ) implies ( t1 ) = ( t2 )

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480 views • 26 slides
Functional Dependencies, BCNF and Normalization

Functional Dependencies, BCNF and Normalization

Functional Dependencies, BCNF and Normalization. Functional Dependencies (FDs). A functional dependency X Y holds over relation R if, for every allowable instance r of R: t1 r, t2 r, ( t1 ) = ( t2 ) implies ( t1 ) = ( t2 )

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1.06k views • 25 slides
Functional Dependencies

Functional Dependencies

Functional Dependencies. CS 186, Spring 2006, Lecture 21 R&G Chapter 19. Science is the knowledge of consequences, and dependence of one fact upon another. Thomas Hobbes (1588-1679 ). Review: Database Design. Requirements Analysis user needs; what must database do? Conceptual Design

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314 views • 17 slides

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