'Particular relation r' diaporamas de présentation

Chapter 8: Relational Database Design

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Recap of Feb 13: SQL, Relational Calculi, Functional Dependencies

Recap of Feb 13: SQL, Relational Calculi, Functional Dependencies. SQL: multiple group bys , having , lots of examples Tuple Calculus Domain Calculus Functional Dependencies F+ = the closure of the set of FDs on a given relation. Relational Database Design.

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Chapter 8: Relational Database Design

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Functional Dependence

Functional Dependence. In a relation including attribute A and B, B is functional dependent on A if, for every valid occurrence, the value A determines the value B An occurrence can not be used to show that a dependency is true, only that it is false A and B can be composite

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