SQL and Relational Theory : How to Write Accurate SQL Code

by Date, C. J.

• ISBN13: 9780596523060
• ISBN10: 0596523068
• Format: Paperback
• Copyright: 2009-02-05
• Publisher: Oreilly & Associates Inc

Summary

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.

Author Biography

C.J. Date has a stature that is unique within the database industry. C.J. is a prolific writer, and is well-known for his best-selling textbook: An Introduction to Database Systems (Addison Wesley). C.J. is an exceptionally clear-thinking writer who can lay out principles and theory in a way easily understood by his audience.

Table of Contents

Preface

Setting the Scene

Types and Domains

Tuples and Relations, Rows and Tables

No Duplicates, No Nulls

Base Relvars, Base Tables

SQL and Relational Algebra I: The Original Operators

SQL and Relational Algebra II: Additional Operators

SQL and Constraints

SQL and Views

SQL and Logic

Using Logic to Formulate SQL Expressions

Miscellaneous SQL Topics

The Relational Model

Database Design Theory

Answers to Exercises

Suggestions for Further Reading

Colophon

Table of Contents provided by Publisher. All Rights Reserved.