Preface to the Third Edition
If you have had any contact with a relational database, then it is very likely that you have seen the letters “SQL.” SQL (Structured Query Language) is a computer language designed to manipulate relational databases. You can use it to define a database's structure, to modify data, and to retrieve data.
This book has been written to give you an in-depth introduction to using SQL, providing a gentle but complete approach to learning the language. You will learn not only SQL syntax, but also how SQL works. Understanding the “how” as well as the “what” will help you create SQL statements that execute as quickly as possible.
The elements of the SQL language covered in the first four parts of this book are based on those parts ...
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