Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au> writes:
> Is it true to say that it's impossible for me to allow comments on
> casts, as there is no OID on the pg_cast table?
Eh?
regression=# select oid from pg_cast;
oid
-------
16420
16421
16422
16423
16424
... etc ...
It would be a very serious design error if pg_cast didn't have OIDs,
because then pg_cast entries couldn't have dependency entries in
pg_depend.
regards, tom lane