H.3. Procedural Languages
PostgreSQL includes several procedural languages with the base distribution: PL/pgSQL , PL/Tcl , PL/Perl , and PL/Python .
In addition, there are a number of procedural languages that are developed and maintained outside the core PostgreSQL distribution. A list of procedural languages is maintained on the PostgreSQL wiki. Note that some of these projects are not released under the same license as PostgreSQL . For more information on each procedural language, including licensing information, refer to its website and documentation.