primary keys

Here is a code extract from phpPgAdmin that dumps UNIQUE and PRIMARY
constraints. Feel free to use the query...

-----Original Message-----
From: pgsql-hackers-owner@postgresql.org
[mailto:pgsql-hackers-owner@postgresql.org]On Behalf Of Felipe Diaz Cardona
Sent: Sunday, January 14, 2001 7:17 AM
To: pgsql-hackers@postgresql.org
Subject: [HACKERS] primary keys

Hi.

Dos any one know any sql sentence to Find primary keys in a table.

I'm using postgresql v.7.0 (Mandrake 7.2)