PostgreSQL 8.4.12 Documentation
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# Chapter 34. 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 34.3)

- aggregates (starting in Section 34.10)

- data types (starting in Section 34.11)

- operators (starting in Section 34.12)

- operator classes for indexes (starting in Section 34.14)

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