"Vernon Smith" <vwu98034@lycos.com> writes:
> mm=# delete from signon where user_id='210';
> ERROR: get_typdefault: failed to lookup type 0
This looks like it could be an issue with improper handling of a deleted
column, but since you haven't mentioned your PG version or offered any
details about the table being operated on, it's impossible to speculate
further.
regards, tom lane