declare
  max_id_client NUMBER;
  max_id_street NUMBER;
  i NUMBER;
  rand1 NUMBER;
  rand2 NUMBER;
  random_address VARCHAR2(50);
  random_street  VARCHAR2(40);

begin
  select max(id) into max_id_client from CLIENT;
  select max(id) into max_id_street  from US_STREET;
  
  for i in 1..max_id_client loop
    rand1:=round(dbms_random.value(1,max_id_street));
    rand2:=round(dbms_random.value(1,400));
    
    select FULLNAME into random_street from US_STREET where ID=rand1;
    random_address:=to_char(rand2)||' '||random_street;

    update CLIENT set ADDRESS=random_address where ID=i;
  end loop;
  commit;
end;
/