'Tuple relational calculus' diaporamas de présentation

Chapter 3: Relational Model

Chapter 3: Relational Model. Structure of Relational Databases Relational Algebra Tuple Relational Calculus Domain Relational Calculus Extended Relational-Algebra-Operations Modification of the Database Views. Database System Concepts : Fifth Edition

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Chapter 6 The Relational Algebra and Relational Calculus

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The Relational Calculus

The Relational Calculus. Chapter Outline. Relational Calculus Tuple Relational Calculus Domain Relational Calculus. Relational Calculus. A relational calculus expression: creates a new relation, which is specified in terms of variables

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The Relational Calculus

The Relational Calculus. Chapter Outline. Relational Calculus Tuple Relational Calculus Domain Relational Calculus. Relational Calculus. A relational calculus expression: creates a new relation, which is specified in terms of variables

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Chapter 4

Chapter 4. Relational Algebra and Relational Calculus Transparencies. Chapter 4 - Objectives. Meaning of the term relational completeness. How to form queries in relational algebra. How to form queries in tuple relational calculus. How to form queries in domain relational calculus.

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Relational Algebra and Calculus

Relational Algebra and Calculus. Chapter 4. Relational Query Languages. Query languages : Allow manipulation and retrieval of data from a database Relational model supports simple, powerful QLs: Strong formal foundation based on logic Allows for much optimization

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L ogics for D ata and K nowledge R epresentation

L ogics for D ata and K nowledge R epresentation. Query languages. Originally by Alessandro Agostini and Fausto Giunchiglia Modified by Fausto Giunchiglia, Rui Zhang and Vincenzo Maltese. Outline. Relational and Algebraic Structures Answer set Relational schemas and Databases

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Relational Calculus

?. Relational Calculus. ?. CS 186, Spring 2006, Lecture 9 R&G, Chapter 4. We will occasionally use this arrow notation unless there is danger of no confusion. Ronald Graham Elements of Ramsey Theory. Relational Calculus.

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Relational Calculus

Relational Calculus. Chapter 4, Part B. Relational Calculus. Comes in two flavors: Tuple relational calculus (TRC) and Domain relational calculus (DRC) . Calculus has variables, constants, comparison ops , logical connectives and quantifiers .

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Chapter 2

Chapter 2. Introduction to Relational Model. Example of a Relation. attributes (or columns). tuples (or rows). Attribute Types. The set of allowed values for each attribute is called the domain of the attribute

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Tuple Relational Calculus

Tuple Relational Calculus. A query language, where each query is of the form { t | P ( t ) } It is the set of all tuples t such that predicate P is true for t t is a tuple variable , t [ A ] denotes the value of tuple t on attribute A

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Relational Calculus and QBE

Relational Calculus and QBE. Chapter 8 (skim). The Relational Calculus. Like the Relational Algebra... An abstract DB language No aggregate operators R.A. and R.C. can accomplish the same results "relationally complete" "Queries" describe sets { | } with desired properties

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