select count(map.object_id_two) as number_of_members
from acs_rels map
where map.object_id_one = :evaluation_group_id
select p.last_name||', '||p.first_names as student_name,
p.person_id as student_id,
map.rel_id
from persons p, acs_rels map
where p.person_id = map.object_id_two
and map.object_id_one = :evaluation_group_id
$orderby