PostgreSQL 9.6.6 Documentation
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# Chapter 36. 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 36.3)

- aggregates (starting in Section 36.10)

- data types (starting in Section 36.11)

- operators (starting in Section 36.12)

- operator classes for indexes (starting in Section 36.14)

- packages of related objects (starting in Section 36.15)

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Server Programming | Up | How Extensibility Works