SQL>
SQL> create table myTable
2 as
3 select rownum id, a.*
4 from all_objects a
5 where 1=0
6 /
Table created.
SQL>
SQL> select *
2 from myTable myTable1, ( select owner, max(last_ddl_time) max_time from myTable group by owner ) myTable2
3 where myTable1.owner = myTable2.owner
4 /
no rows selected
SQL> drop table myTable;
Table dropped.