postgresql9.0 select c.constraint_id, c.constraint_name from rel_constraints c application_group_segments s1, application_group_segments s2 where s1.segment_id = c.rel_segment and s1.package_id = :package_id and s2.segment_id = c.required_rel_segment and s2.package_id = :package_id and acs_permission__permission_p(c.constraint_id, :user_id, 'read') order by lower(c.constraint_name)