'Relation schema' presentation slideshows

Chapter 3 relational model

Chapter 3 relational model. 3.1 An Informal Look at the Relational Model 3.2 The Relational Algebra 3.3 Extended Relational-Algebra Operation 3.4 Relational Calculus 3.5 The Tuple Relational Calculus 3.6 The Domain Relational Calculus 3.7 Modification of the Database

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Midterm 3 Revision and ID3

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Database Principles

Database Principles. College of Computer Science and Technology Chongqing University of Posts & Telecom. Chapter 2 The Relational Model of Data. Data Models Relational Model Relation Schema Definition Relational Algebraic. What is Data Model?.

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Chapter 6

Chapter 6. Relational Normalization Theory. Limitations of E-R Designs. Provides a set of guidelines, does not result in a unique database schema Does not provide a way of evaluating alternative schemas

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Database Systems Chapter 6 The Relational Algebra

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Relational Model

Relational Model. The main reference of this presentation is the textbook and PPT from : Elmasri & Navathe, Fundamental of Database Systems, 4 th edition, 2004, Chapter 5 Additional resources: presentation prepared by Prof Steven A. Demurjian, Sr (http://www.engr.uconn.edu/~steve/courses.html).

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??? ???? ?????? ??????. Lecture ( 12&13 ). Chapter 10. Functional Dependencies and Normalization for Relational Databases. Informal Design Guidelines for Relational Databases. What is relational database design? The grouping of attributes to form "good" relation schemas

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Relational Database Design

Relational Database Design. Relational Database Design. Each relation schema consists of a number of attributes Database schema consists of a number of such relation schemas Relational database design ultimately produces a set of relations

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The Relational Data Model

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Chapter 7: Relational Database Design

Chapter 7: Relational Database Design. Pitfalls in Relational Database Design Decomposition Normalization Using Functional Dependencies Normalization Using Multivalued Dependencies Normalization Using Join Dependencies Domain-Key Normal Form Alternative Approaches to Database Design.

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Functional Dependencies And Normalization

Functional Dependencies And Normalization. R&G Chapter 19. Review: Database Design. Requirements Analysis user needs; what must database do? Conceptual Design high level descr (often done w/ER model) Logical Design translate ER into DBMS data model Schema Refinement

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Combining Keyword Search and Forms for Ad Hoc Querying of Databases

Combining Keyword Search and Forms for Ad Hoc Querying of Databases. (Eric Chu, Akanksha Baid, Xiaoyong Chai, AnHai Doan, Jeffrey Naughton) Computer Sciences Department University of Wisconsin-Madison {ericc, baid, xchai, anhai, naughton} @cs.wisc.edu. Contents. Motivation Query Forms

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Relational Model

Relational Model. Table = relation . Column headers = attributes . Row = tuple Beers Relation schema = name(attributes) + other structure info., e.g., keys, other constraints. Example: Beers(name, manf)

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Relational Data Model

Relational Data Model. Overview. Relational data model; Tuples and relations; Schemas and instances; Named vs. unnamed perspective; Relational algebra;. Table. Observations. The rows of the table contain pairs occurring in the relation player .

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Schema Refinement

Schema Refinement. Chapter 19 (part 1) Functional Dependencies. The Evils of Redundancy. Redundancy is at the root of several problems associated with relational schemas: redundant storage, insert/delete/update anomalies Main refinement technique: decomposition

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Normalization

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1NF, 2NF, and 3NF

1NF, 2NF, and 3NF. By Vishal Punjabi. Basics. Lets first review Superkey Candidate Key Primary Key. Superkey. A set of one or more attributes, which taken collectively, uniquely identifies a tuple of a relation is referred to as a the superkey of the relation schema. Example.

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Functional Dependency

Functional Dependency . Murat Kantarcioglu. Functional Dependencies . Let R be a relation schema ? ? R and ? ? R The functional dependency

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ICS 321 Spring 2011 Normal Forms 1

ICS 321 Spring 2011 Normal Forms 1. Asst. Prof. Lipyeow Lim Information & Computer Science Department University of Hawaii at Manoa. The Problem with Redundancy. Hourly_Emps. Suppose hourly wages are determined by rating Redundant storage : (8,10) stored multiple times

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1. (25) Answer the following questions:

REL_NAME INDEX_NAME MEMBER_ATTR INDEX_TYPE ATTR_NO ASC_DESC. Assignment #1 (Assignment due: Mon., Feb. 04, 2014). 1. (25) Answer the following questions: i) Why must the meta data be established for a database?

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