'Relational algebra expression' diaporamas de présentation

Relational Model and Relational Algebra

Relational Model and Relational Algebra. What is the relational model? Relational algebra?. The relational model is an abstract (mathematical) modeling of a table Relational algebra (RA) is a (mathematical) query language for relations

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Relational Algebra

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Chapter 11

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An Overview of Query Optimization

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Query Evaluation

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Efficient Query Evaluation on Probabilistic Databases

Efficient Query Evaluation on Probabilistic Databases. Papers by Nilesh Dalvi , Dan Suciu , Chris Re. Outline. Motivation Definitions through examples Evaluation Complexity. Motivation. Imprecise information on the web Partial Information Contradictions Imprecise queries.

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SQL Structured Query Language

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Relational Algebra

Relational Algebra. Chapter 6. Lecture Outline. Unary Relational Operations: SELECT and PROJECT Relational Algebra Operations from Set Theory Binary Relational Operations: JOIN and DIVISION Query Trees. The Relational Algebra. Relational algebra

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Chapter 2 Intro to Relational Model

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CS609 Introduction

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The Relational Algebra

The Relational Algebra. CONTENTS. 1 RELATIONAL ALGEBRA 2 UNARY RELATIONAL OPERATIONS * SELECT OPERATION * PROJECT OPERATION * RENAME OPERATION. Relational Algebra.

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6.830 / 6.814 Lecture 2 Data Models

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Relational Algebra

Relational Algebra. A collection of operators for manipulating relations A relation is a set of tuples The result of each relational algebra expression is a relation For this discussion we will strictly following the definition of a set so the will be no duplicate tuples in a relation

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