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Schema Refinement and Normal Forms

Schema Refinement and Normal Forms. 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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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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398 views • 28 slides

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New relation scheme - PowerPoint PPT Presentation

Schema Refinement and Normal Forms

Schema Refinement and Normalization