'Dependency preserving decomposition' diaporamas de présentation

Carnegie Mellon Univ. Dept. of Computer Science 15-415/615 - DB Applications

1.61k views • 71 slides

Carnegie Mellon Univ. Dept. of Computer Science 15-415/615 - DB Applications

799 views • 71 slides

Carnegie Mellon Univ. Dept. of Computer Science 15-415/615 - DB Applications

717 views • 71 slides

Schema Refinement and Normal Forms

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

633 views • 42 slides

Schema Refinement and Normal Forms

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

491 views • 42 slides

Schema Refinement and Normal Forms

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

570 views • 42 slides

Schema Refinement and Normal Forms

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

429 views • 42 slides

Schema Refinement and Normal Forms

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

423 views • 42 slides

Schedule

353 views • 28 slides

Normalization

365 views • 22 slides

Schema Refinement and Normalization

Schema Refinement and Normalization. Nobody realizes that some people expend tremendous energy merely to be normal. Albert Camus. Functional Dependencies (Review). A functional dependency X ? Y holds over relation schema R if, for every allowable instance r of R:

224 views • 22 slides

Theoretical Aspects of Normalization

Theoretical Aspects of Normalization. Functional Dependencies (FDs). A functional dependency X Y holds over relation R if, for every allowable instance r of R: t1 r, t2 r, ( t1 ) = ( t2 ) implies ( t1 ) = ( t2 )

241 views • 13 slides

Chapter 11

Chapter 11. Relational Database Design Algorithms and Further Dependencies. Properties of Relational Decompositions. Relation Decomposition and Insufficiency of Normal Forms Dependency Preservation Property of a Decomposition Lossless (Nonadditive) Join Property of a Decomposition

95 views • 9 slides

Chapter 11

Chapter 11. Relational Database Design Algorithms and Further Dependencies. Properties of Relational Decompositions. Relation Decomposition and Insufficiency of Normal Forms Dependency Preservation Property of a Decomposition Lossless (Nonadditive) Join Property of a Decomposition

94 views • 9 slides