Chapter 40. Extending SQL
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## Chapter 40. Extending SQL

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

- functions (starting in Section 40.3)

- aggregates (starting in Section 40.12)

- data types (starting in Section 40.13)

- operators (starting in Section 40.14)

- operator classes for indexes (starting in Section 40.16)

- packages of related objects (starting in Section 40.17)

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Part V. Server Programming | Home | 40.1. How Extensibility Works