postgresql7.1 select t.object_type as rel_type, t.pretty_name, t.indent, coalesce(num.number_relationships,0) as number_relationships from (select t2.pretty_name, t2.object_type, t2.tree_sortkey as inner_sortkey, repeat(' ', (tree_level(t2.tree_sortkey) - tree_level(t1.tree_sortkey)) * 4) as indent from acs_object_types t1, acs_object_types t2 where t2.tree_sortkey between t1.tree_sortkey and tree_right(t1.tree_sortkey) and t1.object_type in ('contact_rel')) t left join (select r.rel_type, count(*) as number_relationships from acs_objects o, acs_rel_types r, app_group_distinct_rel_map m where r.rel_type = o.object_type and o.object_id = m.rel_id and m.package_id = :package_id group by r.rel_type) num on (t.object_type = num.rel_type) order by t.inner_sortkey