Lisp as procedural language

Hello

I see the following

proba=> select * from pg_language;
lanname |lanispl|lanpltrusted|lanplcallfoid|lancompiler
--------+-------+------------+-------------+--------------
internal|f |f | 0|n/a
lisp |f |f | 0|/usr/ucb/liszt
C |f |f | 0|/bin/cc
sql |f |f | 0|postgres
plpgsql |t |t | 56702850|PL/pgSQL

Would you mind to tell me is it possible to use Lisp
as procedural language ? Which Lisp (e.g Emacs-list,
Common Lisp, etc.). If it is possible could you give
me hints how I can do that ?

I'm using PosgtreSQL 7.0, Slackware 7.0, also I have
Common Lisp (CMUCL 18c) installed.

--
Vladimir Zolotych gsmith(at)eurocom(dot)od(dot)ua