postgresql7.1
select t.object_type as rel_type, t.pretty_name, t.indent,
coalesce(num.number_relationships,0) as number_relationships
from (select t.pretty_name, t.object_type, tree_sortkey as inner_sortkey,
lpad(' ', (tree_level(tree_sortkey) - 1) * 4) as indent
from acs_object_types t
where (t.tree_sortkey like (select tree_sortkey || '%' from acs_object_types
where object_type='membership_rel')
or t.tree_sortkey like (select tree_sortkey || '%' from acs_object_types
where object_type='composition_rel'))
order by lower(t.pretty_name)) 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