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PostgreSQL: Documentation: 9.1: Extending SQL

This documentation is for an unsupported version of PostgreSQL.

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version, or one of the other supported versions listed above instead.

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

• functions (starting in Section 35.3)

• aggregates (starting in Section 35.10)

• data types (starting in Section 35.11)

• operators (starting in Section 35.12)

• operator classes for indexes (starting in Section 35.14)

• packages of related objects (starting in Section 35.15)

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