The following may help, substitiuting "tablename";
select a.attname
from pg_index i, pg_attribute a
where i.indrelid =
(select oid as class_oid from pg_class where relname = 'tablename')
and i.indkey[0] = a.attnum
and a.attrelid = i.indrelid
and i.indisprimary = 't';
swalker writes:
> Is there a query I can run against the pg system tables to figure out what
> columns of the table make up the primary key?
>
> I've messed around w/ psql -E (which is very cool btw) and can't seem to
> find the exact query I'm looking for. I can get all indexes for a table,
> but I can't seem to limit the result set to only the primary key.
>
> Am I missing something obvious ?
>
> Thanks
> Steve
>
>
--
Rex McMaster rex@mcmaster.wattle.id.au
http://www.compsoft.com.au/~rmcm/pgp-pk