SQL: 1999 - Understanding Relational Language Components by Jim Melton

By Jim Melton

It's a excellent assurance of SQL commonplace, yet i did not just like the kind of writing. similar to many SQL books you need to spend it slow the pattern database with a purpose to comprehend the concept.This to me is a waste of time and annoying.The distinction is obvious if you happen to examine it to different books like Date's "Introduction to Database Systems".

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Additional info for SQL: 1999 - Understanding Relational Language Components (The Morgan Kaufmann Series in Data Management Systems)

Example text

Found in commercial object-oriented database management systems (ODBMSs) since the late 1980s. Many believe that these products, commonly referred to as extended relational, or object-relational, database management systems (that is, their core capabilities are extended with those from the object-oriented world), combine the best of both worlds. Not everyone agrees with this trend and the results, however. Many relational "purists" decry the ever-continuing move away from the rigid foundations of the relational model.

Even t h o u g h the table-and-column structure of a relational database is highly flexible with regard to what c o n t e n t you m i g h t wish to store as part of any given table's rows, there are some guidelines that should be followed to help preserve the integrity of the data stored w i t h i n the database. In this section, we'll briefly discuss n o r m a l i z a t i o n m a n d its counterforce, denormalization--to provide some context for the examples we'll provide t h r o u g h o u t this book.

Acknowledgments This is the second book that we have written together, and both of us hope that it won't be the last. We enjoy working together and may well find future projects that we can divide equitably between ourselves. But the costs of writing a book are high, in terms of energy, time spent researching and writing, and time lost from other parts of our lives. ). It's exceedingly rare to do it a l o n e - the assistance of others is necessary and certainly invaluable: for reviews, for trying out ideas and phraseology, and just for offering encouragement.

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