'Bcnf decomposition' diaporamas de présentation

CSC 453 Database Systems Lecture

CSC 453 Database Systems Lecture. Tanu Malik College of CDM DePaul University. Today. Normalization-BCNF Transactions. Normalization Review. |-----Primary Key----|. CourseID | Quarter | Course Name | ------------------------------------------------| CSC401 | 2009-1 | Programming |

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C20.0046: Database Management Systems Lecture #8

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CS 405G: Introduction to Database Systems

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CS411 Database Systems

CS411 Database Systems. Kazuhiro Minami. 08: Midterm Review. Midterm Details. 3:30pm next Tuesday on October 13 75 minutes (regular class time slot) Please arrive early Bring UIUC photoid, pen, pencil, eraser Closed book, no notes. Questions during exam.

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CS 405G: Introduction to Database Systems

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BCNF and Normalization

BCNF and Normalization. Zaki Malik October 21, 2008. Relational Schema Design. Goal of relational schema design is to avoid redundancy and anomalies. Bad Design. name addr beersLiked manf favBeer Janeway Voyager Export Molson G.I. Lager

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Agenda

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Schema Refinement and Normal Forms

Schema Refinement and Normal Forms. Chapter 19. The Evils of Redundancy. Redundancy is at the root of several problems associated with relational schemas: redundant storage, insert/delete/update anomalies

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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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Relational Algebra

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Functional Dependencies and Relational Schema Design

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Relational Design Theory

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Rules for Reasoning about MVDs

Rules for Reasoning about MVDs. Use to identify the MVDs (e.g., from FD to MVD) which are necessary for the decomposition of a relation into 4NF. V W is X Y with X=V ?W and X?Y=W.

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