Contents

• Motivation, Functional dependencies
• Redefining “keys” using FD’s
• Reasoning with FD’s, Attribute closure
• A more complex example
• Example of computing closure
• Using attribute closure
• Rules of FD’s, Example of redundancy
• Decomposition, Unnecessary decomposition
• Lossless join decomposition, Loss? But I got more rows!
• BCNF decomposition algorithm
• Why is BCNF decomposition lossless
• Multivalued dependencies
• Complete MVD + FD rules
• An elegant solution: chase
• 4NF decomposition algorithm

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