Find Last & DML activity

select
          (select to_char(last_ddl_time,'DD-MM-YYYY HH24:MI:SS') from dba_objects where object_name='Table_name' and owner='owner') "DDL Time",
           decode(maxscn,0,'N/A',scn_to_timestamp(maxscn)) "DML Time"
           from
          (select nvl(max(ora_rowscn),0) maxscn from owner.table_name);