Derrick Rice <derrick(dot)rice(at)gmail(dot)com> writes:
> Is there a difference between a global temporary table (if such a thing
> existed in PostgreSQL) and an unlogged table?
Yes --- IIRC, a "global temp table" per spec has session-local contents.
An unlogged table acts just like any other table except with respect to
crash safety.
regards, tom lane