'Fds' presentation slideshows

Chapter 8 Functional Dependencies and Normalization for Relational Databases

Chapter 8 Functional Dependencies and Normalization for Relational Databases. Chapter Outline. 1 Informal Design Guidelines for Relational Databases 1.1Semantics of the Relation Attributes 1.2 Redundant Information in Tuples and Update Anomalies 1.3 Null Values in Tuples

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

737 views • 73 slides

Functional Dependencies and Normalization

Functional Dependencies and Normalization. Instructor: Mohamed Eltabakh meltabakh@cs.wpi.edu. FDs and Normalization. Given a database schema, how do you judge whether or not the design is good? How do you ensure it does not have redundancy or anomaly problems?

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Schema Refinement and Normal Forms

Schema Refinement and Normal Forms. courtesy of Joe Hellerstein for some slides. Jianlin Feng School of Software SUN YAT-SEN UNIVERSITY. Review: Database Design. Requirements Analysis user needs; what must database do? Conceptual Design high level description (often done with ER model)

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Database Systems Overview

Database Systems Overview. Souhad Daraghma. Motivation. Databases are everywhere: Web Corporate records (sales, production, customers,employees, payrolls) Banking systems Stock exchanges Universities, (students, grades) Hospitals Airline systems CD collections at home.

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Functional Dependencies (FDs)

Functional Dependencies (FDs). A function dependency on a relation means that some attribute is a function of a group of other attributes: A4 = f(A1, A2, A3)

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Financial Submissions

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Normalization

Normalization. Instructor: Mohamed Eltabakh meltabakh@cs.wpi.edu. What is Normalization. Normalization is a set of rules to systematically achieve a good design If these rules are followed, then the DB design is guarantee to avoid several problems: Inconsistent data

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Revisit FDs & BCNF Normalization

Revisit FDs & BCNF Normalization. Instructor: Mohamed Eltabakh meltabakh@cs.wpi.edu. Announcements. Project Phase 2 is due Now !!! Project Phase 3 will be out today (Nov. 11) and due on Nov. 22 (8:00am) Project feedback !!! Keep in mind the midterm exam is on Nov. 22. FDs and Normalization.

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Logical Database Design (3 of 3)

Logical Database Design (3 of 3). John Ortiz. Normalization. If a relation is not in BCNF or 3NF, we refine it by decomposing it into two or more smaller relation schemas that are in the normal form. Decomposition has to be used carefully, since there are potential problems.

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Propagating Functional Dependencies with Conditions

Propagating Functional Dependencies with Conditions. Dependency propagation: The problem. Sources. Target. Given a set  of functional dependencies (FDs) that hold on some of the sources Questions : Do these dependencies hold on the target ?

371 views • 25 slides

Schema Refinement

Schema Refinement. Learning Objectives. Identify update, insertion and deletion anomalies Identify possible keys given an instance Identify possible functional dependencies in a relation Determine all keys in a schema. What is Schema Refinement?.

448 views • 24 slides

Schema Refinement

Schema Refinement. Learning Objectives. Identify update, insertion and deletion anomalies Identify possible keys given an instance Identify possible functional dependencies in a relation Determine all keys in a schema. What is Schema Refinement?.

328 views • 24 slides

Normalisation to 3NF

Normalisation to 3NF. Database Systems Lecture 11 Natasha Alechina. In This Lecture. Normalisation to 3NF Data redundancy Functional dependencies Normal forms First, Second, and Third Normal Forms For more information Connolly and Begg chapter 13

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ETHICS COUNSELOR FDS DUTIES

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Federated Directory Services

Federated Directory Services. Revised Proposal for 2009/10 presented to the IT Infrastructure Planning Committee J. Caumanns, O. Rode, R. Kuhlisch, FHGISST 12 October 2009. Problem Statement. 2008: 1 Proposal for a directory profile 2009: 3 Proposals for directory profiles

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Functional Dependencies

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Relationships among FDs and ERDs.

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Relationships among FDs and ERDs.

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Investment options- thinking beyond the obvious

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148 views • 6 slides