postgresql7.1 select rel_constraint__new( null, 'rel_constraint', :constraint_name, :segment_id, 'two', rel_segment__get(:supersite_group_id, 'membership_rel'), null, :user_id, :creation_ip ); select t2.object_type from acs_object_types t1, acs_object_types t2 where t1.object_type = :object_type and t1.tree_sortkey between t2.tree_sortkey and tree_right(t2.tree_sortkey) order by t2.tree_sortkey desc