Chapter 39. Extending SQL
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## Chapter 39. 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 39.3)

- aggregates (starting in Section 39.12)

- data types (starting in Section 39.13)

- operators (starting in Section 39.14)

- operator classes for indexes (starting in Section 39.16)

- packages of related objects (starting in Section 39.17)

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Part V. Server Programming | Home | 39.1. How Extensibility Works