Sql And Relational Theory 2nd Edition

SQL and Relational Theory  2nd Edition PDF
Author: C. J. Date
Publisher:
ISBN:
Size: 44.73 MB
Format: PDF
Category : Database management
Languages : en
Pages : 444
View: 3369

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SQL is full of difficulties and traps for the unwary. You can avoid them if you understand relational theory, but only if you know how to put the theory into practice. In this insightful book, author C.J. Date explains relational theory in depth, and demonstrates through numerous examples and exercises how you can apply it directly to your use of SQL. This second edition includes new material on recursive queries, "missing information" without nulls, new update operators, and topics such as aggregate operators, grouping and ungrouping, and view updating. If you have a modest-to-advanced background in SQL, you'll learn how to deal with a host of common SQL dilemmas. Why is proper column naming so important? Nulls in your database are causing you to get wrong answers. Why? What can you do about it? Is it possible to write an SQL query to find employees who have never been in the same department for more than six months at a time? SQL supports "quantified comparisons," but they're better avoided. Why? How do you avoid them? Constraints are crucially important, but most SQL products don't support them properly. What can you do to resolve this situation? Database theory and practice have evolved since the relational model was developed more than 40 years ago. SQL and Relational Theory draws on decades of research to present the most up-to-date treatment of SQL available. C.J. Date has a stature that is unique within the database industry. A prolific writer well known for the bestselling textbook An Introduction to Database Systems (Addison-Wesley), he has an exceptionally clear style when writing about complex principles and theory.

Sql And Relational Theory

SQL and Relational Theory PDF
Author: C.J. Date
Publisher: "O'Reilly Media, Inc."
ISBN: 9780596555429
Size: 33.88 MB
Format: PDF, ePub, Docs
Category : Computers
Languages : en
Pages : 428
View: 2645

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Understanding SQL's underlying theory is the best way to guarantee that your SQL code is correct and your database schema is robust and maintainable. On the other hand, if you're not well versed in the theory, you can fall into several traps. In SQL and Relational Theory, author C.J. Date demonstrates how you can apply relational theory directly to your use of SQL. With numerous examples and clear explanations of the reasoning behind them, you'll learn how to deal with common SQL dilemmas, such as: Should database access granted be through views instead of base tables? Nulls in your database are causing you to get wrong answers. Why? What can you do about it? Could you write an SQL query to find employees who have never been in the same department for more than six months at a time? SQL supports "quantified comparisons," but they're better avoided. Why? How do you avoid them? Constraints are crucially important, but most SQL products don't support them properly. What can you do to resolve this situation? Database theory and practice have evolved since Edgar Codd originally defined the relational model back in 1969. Independent of any SQL products, SQL and Relational Theory draws on decades of research to present the most up-to-date treatment of the material available anywhere. Anyone with a modest to advanced background in SQL will benefit from the many insights in this book.

Sql And Relational Theory

SQL and Relational Theory PDF
Author: C. Date
Publisher: "O'Reilly Media, Inc."
ISBN: 1449316409
Size: 72.18 MB
Format: PDF
Category : Computers
Languages : en
Pages : 428
View: 7630

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SQL is full of difficulties and traps for the unwary. You can avoid them if you understand relational theory, but only if you know how to put the theory into practice. In this insightful book, author C.J. Date explains relational theory in depth, and demonstrates through numerous examples and exercises how you can apply it directly to your use of SQL. This second edition includes new material on recursive queries, “missing information” without nulls, new update operators, and topics such as aggregate operators, grouping and ungrouping, and view updating. If you have a modest-to-advanced background in SQL, you’ll learn how to deal with a host of common SQL dilemmas. Why is proper column naming so important? Nulls in your database are causing you to get wrong answers. Why? What can you do about it? Is it possible to write an SQL query to find employees who have never been in the same department for more than six months at a time? SQL supports “quantified comparisons,” but they’re better avoided. Why? How do you avoid them? Constraints are crucially important, but most SQL products don’t support them properly. What can you do to resolve this situation? Database theory and practice have evolved since the relational model was developed more than 40 years ago. SQL and Relational Theory draws on decades of research to present the most up-to-date treatment of SQL available. C.J. Date has a stature that is unique within the database industry. A prolific writer well known for the bestselling textbook An Introduction to Database Systems (Addison-Wesley), he has an exceptionally clear style when writing about complex principles and theory.

Relational Theory For Computer Professionals

Relational Theory for Computer Professionals PDF
Author: C.J. Date
Publisher: "O'Reilly Media, Inc."
ISBN: 1449369456
Size: 41.96 MB
Format: PDF, Mobi
Category : Computers
Languages : en
Pages : 284
View: 6848

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All of today’s mainstream database products support the SQL language, and relational theory is what SQL is supposed to be based on. But are those products truly relational? Sadly, the answer is no. This book shows you what a real relational product would be like, and how and why it would be so much better than what’s currently available. With this unique book, you will: Learn how to see database systems as programming systems Get a careful, precise, and detailed definition of the relational model Explore a detailed analysis of SQL from a relational point of view There are literally hundreds of books on relational theory or the SQL language or both. But this one is different. First, nobody is more qualified than Chris Date to write such a book. He and Ted Codd, inventor of the relational model, were colleagues for many years, and Chris’s involvement with the technology goes back to the time of Codd’s first papers in 1969 and 1970. Second, most books try to use SQL as a vehicle for teaching relational theory, but this book deliberately takes the opposite approach. Its primary aim is to teach relational theory as such. Then it uses that theory as a vehicle for teaching SQL, showing in particular how that theory can help with the practical problem of using SQL correctly and productively. Any computer professional who wants to understand what relational systems are all about can benefit from this book. No prior knowledge of databases is assumed.

Time And Relational Theory

Time and Relational Theory PDF
Author: C.J. Date
Publisher: Morgan Kaufmann
ISBN: 0128006757
Size: 30.40 MB
Format: PDF, Kindle
Category : Computers
Languages : en
Pages : 560
View: 816

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Time and Relational Theory provides an in-depth description of temporal database systems, which provide special facilities for storing, querying, and updating historical and future data. Traditionally, database management systems provide little or no special support for temporal data at all. This situation is changing because: Cheap storage enables retention of large volumes of historical data in data warehouses Users are now faced with temporal data problems, and need solutions Temporal features have recently been incorporated into the SQL standard, and vendors have begun to add temporal support to their DBMS products Based on the groundbreaking text Temporal Data & the Relational Model (Morgan Kaufmann, 2002) and new research led by the authors, Time and Relational Theory is the only book to offer a complete overview of the functionality of a temporal DBMS. Expert authors Nikos Lorentzos, Hugh Darwen, and Chris Date describe an approach to temporal database management that is firmly rooted in classical relational theory and will stand the test of time. This book covers the SQL:2011 temporal extensions in depth and identifies and discusses the temporal functionality still missing from SQL. Understand how the relational model provides an ideal basis for taming the complexities of temporal databases Learn how to analyze and evaluate commercial temporal products with this timely and important information Be able to use sound principles in designing and using temporal databases Understand the temporal support recently added to SQL with coverage of the new SQL features in this unique, accurate, and authoritative reference Appreciate the benefits of a truly relational approach to the problem with this clear, user friendly presentation

View Updating And Relational Theory

View Updating and Relational Theory PDF
Author: Chris Date
Publisher: "O'Reilly Media, Inc."
ISBN: 1449357849
Size: 49.91 MB
Format: PDF
Category : Computers
Languages : en
Pages : 240
View: 1192

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Views are virtual tables. That means they should be updatable, just as "real" or base tables are. In fact, view updatability isn’t just desirable, it’s crucial, for practical reasons as well as theoretical ones. But view updating has always been a controversial topic. Ever since the relational model first appeared, there has been widespread skepticism as to whether (in general) view updating is even possible. In stark contrast to this conventional wisdom, this book shows how views, just like base tables, can always be updated (so long as the updates don’t violate any integrity constraints). More generally, it shows how updating always ought to work, regardless of whether the target is a base table or a view. The proposed scheme is 100% consistent with the relational model, but rather different from the way updating works in SQL products today. This book can: Help database products improve in the future Help with a "roll your own" implementation, absent such product improvements Make you aware of the crucial role of predicates and constraints Show you how relational products are really supposed to behave Anyone with a professional interest in the relational model, relational technology, or database systems in general can benefit from this book.

Database Design And Relational Theory

Database Design and Relational Theory PDF
Author: C. J. Date
Publisher: Apress
ISBN: 1484255402
Size: 68.94 MB
Format: PDF, Mobi
Category : Computers
Languages : en
Pages : 451
View: 5763

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Create database designs that scale, meet business requirements, and inherently work toward keeping your data structured and usable in the face of changing business models and software systems. This book is about database design theory. Design theory is the scientific foundation for database design, just as the relational model is the scientific foundation for database technology in general. Databases lie at the heart of so much of what we do in the computing world that negative impacts of poor design can be extraordinarily widespread. This second edition includes greatly expanded coverage of exotic and little understood normal forms such as: essential tuple normal form (ETNF), redundancy free normal form (RFNF), superkey normal form (SKNF), sixth normal form (6NF), and domain key normal form (DKNF). Also included are new appendixes, including one that provides an in-depth look into the crucial notion of data consistency. Sequencing of topics has been improved, and many explanations and examples have been rewritten and clarified based upon the author’s teaching of the content in instructor-led courses. This book aims to be different from other books on design by bridging the gap between the theory of design and the practice of design. The book explains theory in a way that practitioners should be able to understand, and it explains why that theory is of considerable practical importance. Reading this book provides you with an important theoretical grounding on which to do the practical work of database design. Reading the book also helps you in going to and understanding the more academic texts as you build your base of knowledge and expertise. Anyone with a professional interest in database design can benefit from using this book as a stepping-stone toward a more rigorous design approach and more lasting database models. What You Will Learn Understand what design theory is and is not Be aware of the two different goals of normalization Know which normal forms are truly significant Apply design theory in practice Be familiar with techniques for dealing with redundancy Understand what consistency is and why it is crucially important Who This Book Is For Those having a professional interest in database design, including data and database administrators; educators and students specializing in database matters; information modelers and database designers; DBMS designers, implementers, and other database vendor personnel; and database consultants. The book is product independent.

Microsoft Sql Server 2012 T Sql Fundamentals

Microsoft SQL Server 2012 T SQL Fundamentals PDF
Author: Itzik Ben-Gan
Publisher: Pearson Education
ISBN: 0735673950
Size: 12.88 MB
Format: PDF
Category : Computers
Languages : en
Pages : 448
View: 2596

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Gain a solid understanding of T-SQL—and write better queries Master the fundamentals of Transact-SQL—and develop your own code for querying and modifying data in Microsoft SQL Server 2012. Led by a SQL Server expert, you’ll learn the concepts behind T-SQL querying and programming, and then apply your knowledge with exercises in each chapter. Once you understand the logic behind T-SQL, you’ll quickly learn how to write effective code—whether you’re a programmer or database administrator. Discover how to: Work with programming practices unique to T-SQL Create database tables and define data integrity Query multiple tables using joins and subqueries Simplify code and improve maintainability with table expressions Implement insert, update, delete, and merge data modification strategies Tackle advanced techniques such as window functions, pivoting and grouping sets Control data consistency using isolation levels, and mitigate deadlocks and blocking Take T-SQL to the next level with programmable objects

Database Design And Relational Theory

Database Design and Relational Theory PDF
Author: Chris Date
Publisher: "O'Reilly Media, Inc."
ISBN: 1449328016
Size: 31.95 MB
Format: PDF, ePub, Mobi
Category : Computers
Languages : en
Pages : 260
View: 1116

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Because databases often stay in production for decades, careful design is critical to making the database serve the needs of your users over years, and to avoid subtle errors or performance problems. In this book, C.J. Date, a leading exponent of relational databases, lays out the principles of good database design.

Effective Mysql Replication Techniques In Depth

Effective MySQL Replication Techniques in Depth PDF
Author: Ronald Bradford
Publisher: McGraw Hill Professional
ISBN: 0071791876
Size: 11.41 MB
Format: PDF
Category : Computers
Languages : en
Pages : 296
View: 1687

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The Essential Guide to Scaling Your Business Solution Written by Oracle ACE Director and MySQL expert Ronald Bradford, with coauthor Chris Schneider, Effective MySQL: Replication Techniques in Depth describes what is needed to understand and implement MySQL replication to build scalable solutions. This book includes detailed syntax examples to demonstrate the features, options, and limitations of native MySQL replication. Providing an evaluation of various new replication features and additional third-party product implementations, this Oracle Press guide helps to ensure your MySQL environment can support the various high-availability needs of your business. Master the strengths and limitations of native asynchronous replication in a MySQL topology Identify the important features to improve replication for growing business requirements Recognize the key business factors to determine your optimal highavailability needs Understand the benefits of using MySQL replication for failover scenarios Identify the key configuration variables and SQL commands affecting master/ slave replication Learn about the advancements in replication techniques provided by new products, including Tungsten Replicator and Galera Optimize your replication management with various utilities and toolkits Find additional detailed information and presentations at EffectiveMySQL.com.

Pro Sql Server 2008 Relational Database Design And Implementation

Pro SQL Server 2008 Relational Database Design and Implementation PDF
Author: Louis Davidson
Publisher: Apress
ISBN: 1430208678
Size: 61.67 MB
Format: PDF, Mobi
Category : Computers
Languages : en
Pages : 680
View: 472

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Learn effective and scalable database design techniques in a SQL Server environment. Pro SQL Server 2008 Relational Database Design and Implementation covers everything from design logic that business users will understand, all the way to the physical implementation of the design in a SQL Server database. Grounded in best practices and a solid understanding of the underlying theory, authors Louis Davidson, Kevin Kline, Scott Klein, and Kurt Windisch show how to 'get it right' in SQL Server database design and lay a solid groundwork for the future use of valuable business data. Solid foundation in best practices and relational theory Maximize SQL Server features to enhance security, performance, scalability Thorough treatment from conceptual design to an effective, physical implementation

Ranade S Os 2 Extended Edition

Ranade s OS 2 Extended Edition PDF
Author: Jay Ranade
Publisher: Random House Puzzles & Games
ISBN:
Size: 64.32 MB
Format: PDF, ePub
Category : OS/2 (Computer file)
Languages : en
Pages : 680
View: 498

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Sql A Beginner S Guide Fourth Edition

SQL  A Beginner s Guide  Fourth Edition PDF
Author: Andy Oppel
Publisher: McGraw Hill Professional
ISBN: 0071842578
Size: 34.85 MB
Format: PDF, ePub, Docs
Category : Computers
Languages : en
Pages : 544
View: 2759

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This fully revised, self-paced learning tool lays out all the necessary steps to quickly and easily start writing SQL programs Thoroughly updated to reflect the most recent ANSI/ISO standard, SQL: A Beginner's Guide, Fourth Edition will get you up-and-running with SQL programming right away. Clear tutorials, annotated code, and proven instructional tools guide you to easily performing queries and modifications, building databases, creating and reviewing embedded statements, troubleshooting system- and data-related problems, and much more. You will learn how to retrieve, insert, update, and delete database data, and perform management and administrative functions. The book also covers new features, including SQL/XML and the long-awaited temporal support. Code examples are provided throughout along with notes on using them with the latest RDBMS software versions such as MySQL 5.7, SQL Server 2014, and Oracle Database 12c. Platform-neutral coverage; all skills can be applied to any database product, and any SQL version Features hands-on exercises and self-tests that reinforce basic knowledge ”Ask the Expert” sections throughout are filled with bonus information and useful tips

Foundation For Future Database Systems

Foundation for Future Database Systems PDF
Author: C. J. Date
Publisher: Addison-Wesley Professional
ISBN: 9780201709285
Size: 63.44 MB
Format: PDF, Docs
Category : Computers
Languages : en
Pages : 547
View: 7085

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-- Places object databases into perspective and shows how they fit into the relational continuum. -- Includes important new relational algebra and database programming ideas, and a complete new model for database subtyping and inheritance. -- Includes a detailed review of SQL:1999 (SQL3) and the proposals of the Object Data Management Group (ODMG). Foundation for Future Database Systems: The Third Manifesto offers a comprehensive, insightful proposal for the future of object/relational database management systems. Date and Darwen present a precise, formal definition of an abstract model of data that can be used as a blueprint for designing both databases and database languages -- and as a rock-solid foundation for integrating relational and object technologies. This new Second Edition has been revised extensively, with major extensions to its inheritance model; new language proposals, and improved discussions of many key concepts. The book goes beyond formal specifications, with a detailed discussion of the rationale for each proposal. It will be essential reading for everyone with a serious interest in database technology.