Josh Berkus wrote:
> PL/pgSQL, C, and I believe PL/Tcl can interact with the database. No other PL
> at this time can. Hopefully this will change in the future.
PL/R can:
http://www.joeconway.com/plr/doc/plr-spi-rsupport-funcs.html
So can PL/Python:
http://www.postgresql.org/docs/view.php?version=7.3&idoc=0&file=plpython-database.html
Joe