SQL & Relational Theory

 

RELEASE iNFORMATiON TiTLE : SQL and Relational Theory: How to Write Accurate SQL Code AUTHOR : C.J. Date PUBLISHER : O'Reilly Media, Inc. iSBN : 0596523068 MAKER : Team DDU PAGES : 426 Pages PACKAGER : Team DDU EDiTiON : February 5, 2009...


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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. 
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