This book is the official documentation of PostgreSQL. It is being written by the
PostgreSQL developers and other volunteers in parallel to the development of the PostgreSQL software.
It describes all the functionality that the current version of PostgreSQL officially supports.The
contents include: What is PostgreSQL?, A Brief History of PostgreSQL, Conventions, Further Information,
Bug Reporting Guidelines, Tutorial, The SQL Language, Server Administration, Client
Interfaces, Server Programming, Reference, Internals, Appendixes.