postgresql7.4 select number_of_members from evaluation_tasks where task_id = :task_id select task_name, number_of_members as n_of_members from evaluation_tasks where task_id = :task_id select p.last_name ||', '|| p.first_names as student_name, p.person_id as student_id from cc_users p where p.person_id not in (select map.object_id_two from acs_rels map, evaluation_task_groups etg where map.object_id_two = p.person_id and map.object_id_one = etg.group_id and etg.task_id = :task_id and map.rel_type = 'evaluation_task_group_rel') $orderby select g.group_id as evaluation_group_id, g.group_name, count(map.object_id_two) as number_of_members from groups g, evaluation_task_groups etg, acs_rels map where g.group_id = etg.group_id and etg.group_id = map.object_id_one and map.rel_type = 'evaluation_task_group_rel' and etg.task_id = :task_id group by g.group_id, g.group_name $orderby_groups select p.last_name||', '||p.first_names from cc_users p, acs_rels map where p.person_id = map.object_id_two and map.object_id_one = :evaluation_group_id select count(*) from evaluation_task_groups where task_id = :task_id