They are not available in Postgres at the moment, but I believe that covering indexes / index only scans will be coming some time next year, as theres a patch t

They are not available in Postgres at the moment, but I believe that covering indexes / index only scans will be coming some time next year, as theres a patch that should hopefully go into the next release. http://rhaas.blogspot.com/2011/08/index-only-scans-now-theres-patch.html#more http://rhaas.blogspot.com/2011/08/index-only-scans-now-there... http://archives.postgresql.org/pgsql-hackers/2011-08/msg00736.php http://archives.postgresql.org/pgsql-hackers/2011-08/msg0073...