Introduction

SQL, or Structured Query Language, is the primary language used to communicate with relational databases. The goal of this book is to serve as a useful introductory guide to this essential language.

In an alternate universe, the title of this book might have been The Logic of SQL. This is because, like all computer languages, the language of SQL has much more to do with cold hard logic than with English vocabulary. Nevertheless, the word language has been retained in the title for a number of reasons. First, a certain language-based syntax in SQL distinguishes it from other computer languages. Unlike other languages, SQL employs many ordinary words, such as WHERE and FROM, as keywords in its syntax.

In the spirit of the language ...

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