'Lossless join decomposition' presentation slideshows

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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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Normal Forms and XML

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Logical Database Design (3 of 3)

Logical Database Design (3 of 3). John Ortiz. Normalization. If a relation is not in BCNF or 3NF, we refine it by decomposing it into two or more smaller relation schemas that are in the normal form. Decomposition has to be used carefully, since there are potential problems.

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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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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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Decomposition

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ICS 421 Spring 2010 Normal Forms

ICS 421 Spring 2010 Normal Forms. Asst. Prof. Lipyeow Lim Information & Computer Science Department University of Hawaii at Manoa. Two More Rules. Union If X ? Y and X ? Z , then X ? YZ Eg . FLD ? A and FLD ? T, then FLD ? AT Decomposition If X ? YZ , then X ? Y and X ? Z

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