postgresql7.2 select o.object_id, coalesce(f.label, fs_tree.name) as name, fs_tree.live_revision as version_id, fs_tree.content_type, r.content_length, fs_tree.parent_id as folder_id, lpad(' ',(tree_level(fs_tree.tree_sortkey) - 1), ' ') as spaces, rels.related_object_id as homework_file_id, p.first_names || ' ' || p.last_name as file_owner_name, o.creation_user from (select cr_items.* from cr_items, cr_items as cr_items2 where cr_items2.item_id in ([join $list_of_folder_ids ", "]) and cr_items.tree_sortkey between cr_items2.tree_sortkey and tree_right(cr_items2.tree_sortkey) and tree_level(cr_items.tree_sortkey) > :min_level and tree_level(cr_items.tree_sortkey) <= :max_level + 1) fs_tree join acs_objects o on (o.object_id = fs_tree.item_id) left join cr_folders f on (f.folder_id = fs_tree.item_id) left join persons p on (p.person_id = o.creation_user) left join cr_revisions r on (r.revision_id = fs_tree.item_id) left join cr_item_rels rels on (rels.item_id = o.object_id and rels.relation_tag = 'homework_correction') where not exists (select 1 from cr_item_rels where related_object_id = o.object_id and relation_tag = 'homework_correction') $qualify_by_owner order by content_item__get_path(fs_tree.item_id, null)