Share

Query Processing in Database Systems

2012-12-06 Computers
Download Query Processing in Database Systems PDF Online Free

Author :
Release : 2012-12-06
Genre : Computers
Kind : eBook
Book Rating : 750/5 ( reviews)

GET EBOOK


Book Synopsis Query Processing in Database Systems by : W. Kim

Download or read book Query Processing in Database Systems written by W. Kim. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: This book is an anthology of the results of research and development in database query processing during the past decade. The relational model of data provided tremendous impetus for research into query processing. Since a relational query does not specify access paths to the stored data, the database management system (DBMS) must provide an intelligent query-processing subsystem which will evaluate a number of potentially efficient strategies for processing the query and select the one that optimizes a given performance measure. The degree of sophistication of this subsystem, often called the optimizer, critically affects the performance of the DBMS. Research into query processing thus started has taken off in several directions during the past decade. The emergence of research into distributed databases has enormously complicated the tasks of the optimizer. In a distributed environment, the database may be partitioned into horizontal or vertical fragments of relations. Replicas of the fragments may be stored in different sites of a network and even migrate to other sites. The measure of performance of a query in a distributed system must include the communication cost between sites. To minimize communication costs for-queries involving multiple relations across multiple sites, optimizers may also have to consider semi-join techniques.

SQL Queries for Mere Mortals

2014 Computers
Download SQL Queries for Mere Mortals PDF Online Free

Author :
Release : 2014
Genre : Computers
Kind : eBook
Book Rating : 474/5 ( reviews)

GET EBOOK


Book Synopsis SQL Queries for Mere Mortals by : John L. Viescas

Download or read book SQL Queries for Mere Mortals written by John L. Viescas. This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt: The #1 Easy, Common-Sense Guide to SQL Queries--Updated for Today's Databases, Standards, and Challenges SQL Queries for Mere Mortals ® has earned worldwide praise as the clearest, simplest tutorial on writing effective SQL queries. The authors have updated this hands-on classic to reflect new SQL standards and database applications and teach valuable new techniques. Step by step, John L. Viescas and Michael J. Hernandez guide you through creating reliable queries for virtually any modern SQL-based database. They demystify all aspects of SQL query writing, from simple data selection and filtering to joining multiple tables and modifying sets of data. Three brand-new chapters teach you how to solve a wide range of challenging SQL problems. You'll learn how to write queries that apply multiple complex conditions on one table, perform sophisticated logical evaluations, and think "outside the box" using unlinked tables. Coverage includes -- Getting started: understanding what relational databases are, and ensuring that your database structures are sound -- SQL basics: using SELECT statements, creating expressions, sorting information with ORDER BY, and filtering data using WHERE -- Summarizing and grouping data with GROUP BY and HAVING clauses -- Drawing data from multiple tables: using INNER JOIN, OUTER JOIN, and UNION operators, and working with subqueries -- Modifying data sets with UPDATE, INSERT, and DELETE statements Advanced queries: complex NOT and AND, conditions, if-then-else using CASE, unlinked tables, driver tables, and more Practice all you want with downloadable sample databases for today's versions of Microsoft Office Access, Microsoft SQL Server, and the open source MySQL database. Whether you're a DBA, developer, user, or student, there's no better way to master SQL. informit.com/aw forMereMortals.com

CDI Workbook

2018-09
Download CDI Workbook PDF Online Free

Author :
Release : 2018-09
Genre :
Kind : eBook
Book Rating : 066/5 ( reviews)

GET EBOOK


Book Synopsis CDI Workbook by : Sheila Duhon

Download or read book CDI Workbook written by Sheila Duhon. This book was released on 2018-09. Available in PDF, EPUB and Kindle. Book excerpt:

Excel Power Pivot & Power Query For Dummies

2016-03-18 Computers
Download Excel Power Pivot & Power Query For Dummies PDF Online Free

Author :
Release : 2016-03-18
Genre : Computers
Kind : eBook
Book Rating : 666/5 ( reviews)

GET EBOOK


Book Synopsis Excel Power Pivot & Power Query For Dummies by : Michael Alexander

Download or read book Excel Power Pivot & Power Query For Dummies written by Michael Alexander. This book was released on 2016-03-18. Available in PDF, EPUB and Kindle. Book excerpt: A guide to PowerPivot and Power Query no data cruncher should be without! Want to familiarize yourself with the rich set of Microsoft Excel tools and reporting capabilities available from PowerPivot and Power Query? Look no further! Excel PowerPivot & Power Query For Dummies shows you how this powerful new set of tools can be leveraged to more effectively source and incorporate 'big data' Business Intelligence and Dashboard reports. You'll discover how PowerPivot and Power Query not only allow you to save time and simplify your processes, but also enable you to substantially enhance your data analysis and reporting capabilities. Gone are the days of relatively small amounts of data—today's data environment demands more from business analysts than ever before. Now, with the help of this friendly, hands-on guide, you'll learn to use PowerPivot and Power Query to expand your skill-set from the one-dimensional spreadsheet to new territories, like relational databases, data integration, and multi-dimensional reporting. Demonstrates how Power Query is used to discover, connect to, and import your data Shows you how to use PowerPivot to model data once it's been imported Offers guidance on using these tools to make analyzing data easier Written by a Microsoft MVP in the lighthearted, fun style you've come to expect from the For Dummies brand If you spend your days analyzing data, Excel PowerPivot & Power Query For Dummies will get you up and running with the rich set of Excel tools and reporting capabilities that will make your life—and work—easier.

Flexible Query Answering Systems

2006-05-30 Computers
Download Flexible Query Answering Systems PDF Online Free

Author :
Release : 2006-05-30
Genre : Computers
Kind : eBook
Book Rating : 384/5 ( reviews)

GET EBOOK


Book Synopsis Flexible Query Answering Systems by : Henrik Legind Larsen

Download or read book Flexible Query Answering Systems written by Henrik Legind Larsen. This book was released on 2006-05-30. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceeding of the 7th International Conference on Flexible Query Answering Systems, FQAS 2006, held in Milan, Italy in June 2006. The 60 revised full papers presented were carefully reviewed and selected from numerous submissions. The papers are organized in topical sections on flexibility in database management and quering, vagueness and uncertainty in XML quering and retrieval, information retrieval and filtering, multimedia information access, user modeling and personalization, knowledge and data extraction, intelligent information extraction from text, and knowledge representation and reasoning.

You may also like...