commpare 2 tables

I've 2 temp tables build as this same select , how can i find differences
between this tables, for example : find differ rows by same primary key,
or which rows are in one table but not in second ... ??
Is there same simple way, or i will have to compare this table manualy ?

how do samething like : CREATE OR REPLACE TEMP TABLE name AS ... ?

thx :>
 ivan