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Databases - Practical PostgreSQL
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Chapter 3. Understanding SQL

This chapter discusses the history and fundamental concepts of SQL and forms the foundation for the next chapter, which is about applying SQL with PostgreSQL. It addresses the basics of relational databases, object-related database extensions, the structure of a SQL statement, and provides an overview of PostgreSQL-supported data types, operators and functions.

Introduction to SQL

SQL, the Structured Query Language , is a mature, powerful, and versatile relational query language. The history of SQL extends back to IBM research begun in 1970. The next few sections discuss the history of SQL, its predecessors, and the various SQL standards that have developed over the years.

Databases - Practical PostgreSQL
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