'Bcnf decomposition algorithm' presentation slideshows

Lecture 09: Functional Dependencies, Database Design

Lecture 09: Functional Dependencies, Database Design. Monday, January 24, 2005. Outline. Functional dependencies (3.4) Rules about FDs (3.5) Design of a Relational schema (3.6). Functional Dependencies. Definition: A 1 , ..., A m ? B 1 , ..., B n holds in R if:

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Chapter 7: Relational Database Design

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Lecture 10: Database Design

Lecture 10: Database Design. Wednesday, January 26, 2005. Outline. Design of a Relational schema (3.6). Decompositions in General. R(A 1 , ..., A n , B 1 , ..., B m , C 1 , ..., C p ). R 1 (A 1 , ..., A n , B 1 , ..., B m ). R 2 (A 1 , ..., A n , C 1 , ..., C p ).

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StudentClass Table

StudentClass Table. Missing Info?. Closure of Attributes X. Start with X + = X Repeat until no change in X + If there is Y -> Z with Y ? X + , then A dd Z to X +. BCNF Decomposition Algorithm. For any R in the schema If (X -> Y holds on R AND

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