'Relational algebra expressions' diaporamas de présentation

Database Systems Logical Query Languages

Database Systems Logical Query Languages. assoc. prof., dr. Vladimir Dimitrov e-mail: cht@fmi.uni-sofia.bg web: is.fmi.uni-sofia.bg. A Logic for Relations Predicates and Atoms Arithmetic Atoms Datalog Rules and Queries Meaning of Datalog Rules Extensional and Intensional Predicates

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Chapter 14 Query Optimization

Chapter 14 Query Optimization. Chapter 14: Query Optimization. Introduction Catalog Information for Cost Estimation Estimation of Statistics Transformation of Relational Expressions Dynamic Programming for Choosing Evaluation Plans. Introduction.

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Relational Algebra

Relational Algebra. The basic set of operations for the relational model is the relational algebra. enable the specification of basic retrievals The result of a retrieval is a new relation, which may have been formed from one or more relations.

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Chapter 6: Formal Relational Query Languages

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Lecture 2 of 42

Lecture 2 of 42. Relational Databases Discussion: Problem Set 1. Friday, 29 August 2008 William H. Hsu Department of Computing and Information Sciences, KSU KSOL course page: http://snipurl.com/1pq4c Course web site: http://www.kddresearch.org/Courses/Fall-2008/CIS560

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Lecture 2 of 42

Lecture 2 of 42. Relational Databases Discussion: Problem Set 1. Friday, 29 August 2008 William H. Hsu Department of Computing and Information Sciences, KSU KSOL course page: http://snipurl.com/1pq4c Course web site: http://www.kddresearch.org/Courses/Fall-2008/CIS560

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Relational Query Languages

Relational Query Languages. Relational Algebra ( procedural ) Relational Calculus (non-procedural). Relational Languages. Relational Algebra (procedural) defines operations on tables Relational Calculus (declarative) based on first-order predicate calculus

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Relational Query Languages

Relational Query Languages. Naveen Ashish Calit2 &ICS UC-Irvine. Relational Languages. Relational Algebra ( procedural ) defines operations on tables Relational Calculus ( declarative ) based on first-order predicate calculus

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Relational Query Languages

Relational Query Languages. Relational Algebra ( procedural ) Relational Calculus (non-procedural). Relational Languages. Relational Algebra (procedural) defines operations on tables Relational Calculus (declarative) based on first-order predicate calculus

216 views • 21 slides

Nested Queries and Aggregation

Nested Queries and Aggregation. Chapter 5 (6/E) Chapter 8 (5/E). Lecture Outline. More Complex SQL Retrieval Queries Self-Joins Renaming Attributes and Results Grouping, Aggregation, and Group Filtering Ordering Results Nested SPJ Queries. Review of SPJ Queries in SQL.

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COP4710 Database Systems

COP4710 Database Systems. Midterm Review. Fall 2013. Midterm Exam. Time : Friday 10/18/2012 9:05am --- 9:55am Plan your time well Venue : HCB 315, in-class exam Closed book, closed note, but you can bring a piece of cheat sheet (A4, double side) Plan your strategy well

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CS4433 Database Systems

CS4433 Database Systems. Midterm Review. Midterm Exam. Time : Monday 03/08/2019 1:30pm --- 2:20pm Plan your time well Venue : in-class exam Closed book, closed note, but you can bring a one-page cheat sheet (A4, double side) Plan your strategy well

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CH4 EXERCISES

CH4 EXERCISES.

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