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Historical version. PostgreSQL 6.3 reached end of support in March 2003. See the current manual for supported releases.
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Chapter 30. Extending SQL: An Overview

Table of Contents
How Extensibility Works
The Postgres Type System
About the Postgres System Catalogs

In the sections that follow, we will discuss how you can extend the Postgres SQL query language by adding:

  • functions

  • types

  • operators

  • aggregates

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Architecture Up How Extensibility Works

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Read the upstream documentation. For corrections, first check the current manual.