Sql And Relational Theory

SQL and Relational Theory PDF
Author: C.J. Date
Publisher: "O'Reilly Media, Inc."
ISBN: 9780596555429
Size: 30.57 MB
Format: PDF, ePub, Mobi
Category : Computers
Languages : en
Pages : 428
View: 7464

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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: 39.74 MB
Format: PDF
Category : Computers
Languages : en
Pages : 428
View: 4089

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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 2nd Edition

SQL and Relational Theory  2nd Edition PDF
Author: C. J. Date
Publisher:
ISBN:
Size: 36.12 MB
Format: PDF, Mobi
Category : Database management
Languages : en
Pages : 444
View: 1830

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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 3rd Edition

SQL and Relational Theory  3rd Edition PDF
Author: C. J. Date
Publisher:
ISBN:
Size: 71.58 MB
Format: PDF, Docs
Category : Database management
Languages : en
Pages : 582
View: 5298

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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 that theory into practice. In this book, Chris Date explains relational theory in depth, and demonstrates through numerous examples and exercises how you can apply it to your use of SQL. This third edition has been revised, extended, and improved throughout. Topics whose treatment has been expanded include data types and domains, table comparisons, image relations, aggregate operators and summarization, view updating, and subqueries. A special feature of this edition is a new appendix on NoSQL and relational theory.

Time And Relational Theory

Time and Relational Theory PDF
Author: C.J. Date
Publisher: Morgan Kaufmann
ISBN: 0128006757
Size: 38.20 MB
Format: PDF, ePub, Mobi
Category : Computers
Languages : en
Pages : 560
View: 5755

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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

C J Date S Sql And Relational Theory Master Class

C J  Date s SQL and Relational Theory Master Class PDF
Author: C.J. Date
Publisher:
ISBN: 9781449389659
Size: 12.17 MB
Format: PDF, Mobi
Category :
Languages : en
Pages :
View: 4935

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Chris Date is the world's best known relational advocate. In this online seminar, he shows howto write SQL code that's logically correct; how to avoid various SQL traps and pitfalls; and,more generally, how to use SQL as if it were a true relational language. Appreciate how relational principles provide SQL's logical underpinnings. Understand the breadth and depth of those principles. Know how to formulate complex SQL code with confidence that it's correct. Be able to use SQL relationally. SQL is ubiquitous. But SQL is also complicated, difficult, and error prone -- much more so than SQL advocates would have you believe. There's a lot of bad practice in the way SQL is used, and testing SQL can never be exhaustive. If you have any hope of writing correct SQL, you must follow some discipline: the discipline of using SQL relationally. It's a fact: SQL is the standard language for relational databases, but that doesn't make it relational! SQL departs from relational theory in all too many ways. Duplicate rows and nulls provide two obvious examples, but they're not the only ones. In this class, you'll learn relational theory, how SQL departs from the theory, and how to avoid the problems that can cause. By using the relational model as an organizing principle, and learning various features of the model in depth, you'll discover the best ways to implement SQL. And you'll enjoy the benefits of working with a truly relational system. Exercises are an integral part of the class, and your discussion and interaction are encouraged. We are capturing these sessions on video and all students are required to sign a release form prior to the commencement of the class, a copy of which may be downloaded in advance. Hard copy forms will be provided at the event.

Relational Theory For Computer Professionals

Relational Theory for Computer Professionals PDF
Author: C.J. Date
Publisher: "O'Reilly Media, Inc."
ISBN: 1449369456
Size: 20.96 MB
Format: PDF, Docs
Category : Computers
Languages : en
Pages : 284
View: 7249

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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.

Logic And Relational Theory

Logic and Relational Theory PDF
Author: C. J. Date
Publisher: Technics Publications
ISBN: 1634628772
Size: 20.80 MB
Format: PDF
Category : Computers
Languages : en
Pages : 512
View: 7407

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This book is a revised, upgraded, and hugely improved version of an earlier one called Logic and Databases. Although it’s effectively a brand new book, therefore, the following remarks from that earlier book are still relevant here. First, logic and databases are inextricably intertwined. The relational model itself is essentially just elementary logic, tailored to database needs. Now, if you’re a database professional, this won’t be news to you—but you still might not realize just how much everything we do in the database world is (or should be!) affected by logic. Logic is fundamental, and everywhere. As a database professional, therefore, you owe it to yourself to understand the basics of formal logic, and you ought to be able to explain (and perhaps defend) the connections between formal logic and database technology. And that’s what this book is about. What it does is show, through a series of partly independent, partly interrelated essays, just how various crucial aspects of database technology—some of them very familiar, others maybe less so—are solidly grounded in formal logic. Overall, the goal is to help you realize the importance of logic in everything you do, and also, I hope, to help you see that logic can be fun.

View Updating And Relational Theory

View Updating and Relational Theory PDF
Author: Chris Date
Publisher: "O'Reilly Media, Inc."
ISBN: 1449357849
Size: 12.40 MB
Format: PDF, Mobi
Category : Computers
Languages : en
Pages : 240
View: 6727

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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: Chris Date
Publisher: "O'Reilly Media, Inc."
ISBN: 1449328016
Size: 15.74 MB
Format: PDF, Docs
Category : Computers
Languages : en
Pages : 260
View: 5264

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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.

Database In Depth

Database in Depth PDF
Author: C.J. Date
Publisher: "O'Reilly Media, Inc."
ISBN: 1449342647
Size: 80.52 MB
Format: PDF
Category : Computers
Languages : en
Pages : 232
View: 4792

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This book sheds light on the principles behind the relational model, which is fundamental to all database-backed applications--and, consequently, most of the work that goes on in the computing world today. Database in Depth: The Relational Model for Practitioners goes beyond the hype and gets to the heart of how relational databases actually work.Ideal for experienced database developers and designers, this concise guide gives you a clear view of the technology--a view that's not influenced by any vendor or product. Featuring an extensive set of exercises, it will help you: understand why and how the relational model is still directly relevant to modern database technology (and will remain so for the foreseeable future) see why and how the SQL standard is seriously deficient use the best current theoretical knowledge in the design of their databases and database applications make informed decisions in their daily database professional activities Database in Depth will appeal not only to database developers and designers, but also to a diverse field of professionals and academics, including database administrators (DBAs), information modelers, database consultants, and more. Virtually everyone who deals with relational databases should have at least a passing understanding of the fundamentals of working with relational models.Author C.J. Date has been involved with the relational model from its earliest days. An exceptionally clear-thinking writer, Date lays out principle and theory in a manner that is easily understood. Few others can speak as authoritatively the topic of relational databases as Date can.

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: 53.72 MB
Format: PDF, Mobi
Category : Computers
Languages : en
Pages : 448
View: 4230

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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

Logic And Databases

Logic and Databases PDF
Author: C. J. Date
Publisher: Trafford Publishing
ISBN: 1425122906
Size: 25.58 MB
Format: PDF, ePub
Category : Computers
Languages : en
Pages : 445
View: 2682

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Databases are based on logic - right? Everybody knows that. Or do they? Chris Date's most recent book explores the myriad ways in which logic affects the database world.

Pro Oracle Sql

Pro Oracle SQL PDF
Author: Karen Morton
Publisher: Apress
ISBN: 1430262206
Size: 32.47 MB
Format: PDF, Kindle
Category : Computers
Languages : en
Pages : 580
View: 5933

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Pro Oracle SQL, Second Edition unlocks the power of SQL in the Oracle database—one of the most potent SQL implementations on the market today. To master it requires a multi-pronged approach: learn the language features, learn how and why the language features work, learn the supporting features that Oracle provides to help use the language effectively, and learn to think and work in sets. Karen Morton has updated the content for Oracle version 12c and helps you master powerful aspects of Oracle SQL from the inside-out. You’ll learn analytic functions, the MODEL clause, and advanced grouping syntax—features that will help in creating good queries for reporting and business intelligence applications. Pro Oracle SQL, Second Edition also helps you minimize parsing overhead, read execution plans, test for correct results, understand performance management, and exert control over SQL execution in your database. You’ll learn when to create indexes, how to verify that they make a difference, how to use SQL Baselines and Profiles to optimize and stabilize SQL execution plans, and much more. You’ll also understand how SQL is optimized for working in sets, and that the key to getting accurate results lies in making sure that queries ask clear and precise questions. Pro Oracle SQL, Second Edition helps you work at a truly professional level in the Oracle dialect of SQL. You’ll master the language, the tools to work effectively with the language, and the right way to think about a problem in SQL. Endorsed by the OakTable Network, a group of Oracle technologists well-known for their rigorous and scientific approach to Oracle Database performance Comprehensive—goes beyond the language with a focus on what you need to know to write successful queries and data manipulation statements. Performance focused—teaches you how to measure the performance of your SQL statements and not just the syntax. What you’ll learn Master powerful SQL features implemented in the Oracle Database Understand how the Oracle Optimizer develops execution plans Read and interpret SQL execution plans Quickly diagnose and fix badly performing SQL Control execution plans through hints, profiles, and plan baselines Optimize queries within packaged applications without touching the code Recognize when not to waste time on SQL that is performing optimally Who this book is for Pro Oracle SQL, Second Edition is aimed at developers and database administrators who submit SQL for execution by an Oracle database. Readers should already know the basic four SQL statements, and be ready to learn deeply about Oracle’s specific implementation of the language, including Oracle-specific features and syntax. Readers should also want to learn about Oracle Database features such as analytic queries, the MODEL clause, and the WITH clause (subquery factoring) that are designed to help developers and database administrators exert control over their SQL environment and its execution. Table of Contents Core SQL SQL Execution Access and Join Methods SQL is About Sets It’s About the Question SQL Execution Plans Advanced Grouping Analytic Functions The Model Clause Subquery Factoring Semi-joins and Anti-joins Indexes Beyond the SELECT Transaction Processing Testing and Quality Assurance Plan Stability Plan Management/Control Cool SQL Constructs