select segment_id from rel_segments where group_id = :community_id and rel_type = 'dotlrn_member_rel' select segment_id from rel_segments where group_id = :community_id and rel_type = 'dotlrn_admin_rel' select segment_id from rel_segments where rel_type = 'dotlrn_professor_profile_rel' select segment_id from rel_segments where rel_type = 'dotlrn_admin_profile_rel