"Steve" <svanspal(at)bigpond(dot)com> writes:
> What I need to know, is how to find out if a column is a primary, or part of
> a primary key. I need to do this using sql.
In 7.3 this is pretty easy: look in the pg_constraint table for a 'p'
constraint for the table. If you find one, 'conkey' lists the column
numbers of the key columns. In prior versions you'd need to look in
pg_index instead. (Actually the pg_index method still works, but it's
messier.)
See the "System Catalogs" chapter of the documentation.
regards, tom lane