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Design Theory for Relational Databases

Design Theory for Relational Databases. Functional Dependencies Decompositions Normal Forms. Functional Dependencies. X -> Y is an assertion about a relation R that whenever two tuples of R agree on all the attributes of X , then they must also agree on all attributes in set Y .

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Normalization

Normalization. Anomalies Boyce-Codd Normal Form 3 rd Normal Form. Anomalies. Goal of relational schema design is to avoid anomalies and redundancy. Update anomaly : one occurrence of a fact is changed, but not all occurrences. Deletion anomaly : valid fact is lost when a tuple is deleted.

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Favbeer janeway voyager bud - PowerPoint PPT Presentation

Design Theory for Relational Databases

Normalization