PostgreSQL 7.2.1 Documentation
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# 12.3. Procedural Language Functions

Procedural languages aren't built into the PostgreSQL server; they are offered by loadable modules. Please refer to the documentation of the procedural language in question for details about the syntax and how the function body is interpreted for each language.

There are currently four procedural languages available in the standard PostgreSQL distribution: PL/pgSQL, PL/Tcl, PL/Perl, and PL/Python. Other languages can be defined by users. Refer to Chapter 22 for more information. The basics of developing a new procedural language are covered in Section 12.7.

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