"Pavel Stehule" <pavel.stehule@gmail.com> writes:
> if I understand well, there isn't any difference between local and
> global temp tables in postgresql.
See the archives; some time ago we determined that the correct reading
of the spec is that global/local determines visibility of temp tables
across modules, but still within a single session. Since we don't have
modules there is no difference for us.
> I have question. Is correct implementation of global temp in Oracle or
> Firebird, where content of glob.temp table is session visible and
> metadata of g.t.t is persistent?
It's correct per spec. Whether it's more useful than what we do is
highly debatable --- it forces all sessions to use the same definition
of any given temp table name, which is a bit silly for something that's
supposed to support session-local data.
regards, tom lane