oracle :: with count result in top row

with x
as (select  substr(email_adr,instr(email_adr,'@')+1) d
      from  owner.tablename
      where created_dat >= trunc(sysdate))
select  'total'     domain,
        count(d)    cnt
  from  x
union all
select  d,
        count(*)
  from  x
  group by d
  order by 2 desc;