'Bcnf' presentation slideshows

C20.0046: Database Management Systems Lecture #8

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Schema Design & Refinement (cont.)

Schema Design & Refinement (cont.). Lecture #6. What We Covered Last Time. Functional Dependencies and Keys. Functional Dependencies. A form of constraint (hence, part of the schema) Finding them is part of the database design Used heavily in schema refinement. Definition:

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CMSC424: Database Design

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CS 540 Database Management Systems

CS 540 Database Management Systems. Schema Design and Views. Database Implementation. User Requirements. Schema Design. Physical Storage. Conceptual Design. Schema. Relational Model. Entity Relationship(ER) Model. Files and Indexes. E-R Model to Relational Schema. Person. name.

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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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Schedule

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Agenda

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Normalization ???

Normalization ???. Anomalies Boyce-Codd Normal Form 3 rd Normal Form. Anomalies ??. Goal of relational schema design is to avoid anomalies and redundancy. Redundancy : Information may be repeated unnecessarily in several tuples.

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Database Management Systems Chapter 3 The Relational Data Model (III)

Database Management Systems Chapter 3 The Relational Data Model (III). Instructor: Li Ma Department of Computer Science Texas Southern University, Houston. September, 2006. Normalization. Anomalies Boyce-Codd Normal Form 3 rd Normal Form. Anomalies.

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????. ????. ??? ?????? 5.1 ?????. ? ????? ?? ???????????? : R (U, D, dom, F) ?? : (1) ??? R; (2) ???? U; (3) ??? U ???????? D; (4) ??????? dom; (5) ??? U ???????? F. ?? (3),(4) ???????????????????????????? R <U, F>. ?? ???????.

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Functional Dependencies and Relational Schema Design

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Perancangan Basis Data

Perancangan Basis Data. Normalisasi - BCNF. Overview. Normalisasi ke BCNF, dan Contoh BCNF. Table Structure Decomposition BCNF. BCNF (Boyce-Code Normal Form). Ketika sebuah relasi memiliki lebih dari 1 candidate keys , anomali dapat terjadi sekalipun telah berada di 3NF.

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Relational Design Theory

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5.2.3 ??

5.2.3 ??. ????????? ( ????? ) ????? ???? 1NF, 2NF, 3NF, BCNF, 4NF,5NF ??? ( ????? ) ????? 1NF ? 2NF ? 3NF ? BCNF ? 4NF ? 5NF ????????? R ???????? R ? x NF. 1NF(First Normal Form). ????? R ????????????????? R ?1NF ??? 1NF ?????????? ???

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Normalization

Normalization. Normal Forms. If a relation is in a certain normal form ( BCNF, 3NF etc.), it is known that certain kinds of redundancies are avoided/minimized. This can be used to help us decide whether decomposing the relation will help. Role of FDs in detecting redundancy:

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Normalization

Normalization. Normal Forms. If a relation is in a certain normal form ( BCNF, 3NF etc.), it is known that certain kinds of redundancies are avoided/minimized. This can be used to help us decide whether decomposing the relation will help. Role of FDs in detecting redundancy:

293 views • 11 slides

Normalization

Normalization. Normal Forms. If a relation is in a certain normal form ( BCNF, 3NF etc.), it is known that certain kinds of redundancies are avoided/minimized. This can be used to help us decide whether decomposing the relation will help. Role of FDs in detecting redundancy:

112 views • 11 slides