Preface
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# Preface

This book is the official documentation of PostgreSQL™. It has been 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.

To make the large amount of information about PostgreSQL™ manageable, this book has been organized in several parts. Each part is targeted at a different class of users, or at users in different stages of their PostgreSQL™ experience:

- Part I is an informal introduction for new users.

- Part II documents the SQL query language environment, including data types and functions, as well as user-level performance tuning. Every PostgreSQL™ user should read this.

- Part III describes the installation and administration of the server. Everyone who runs a PostgreSQL™ server, be it for private use or for others, should read this part.

- Part IV describes the programming interfaces for PostgreSQL™ client programs.

- Part V contains information for advanced users about the extensibility capabilities of the server. Topics include user-defined data types and functions.

- Part VI contains reference information about SQL commands, client and server programs. This part supports the other parts with structured information sorted by command or program.

- Part VII contains assorted information that might be of use to PostgreSQL™ developers.

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