text: create user danan identified by password;
  grant create session to danan;
  create tablespace danan datafile 'E:\oraclexe\app\oracle\oradata\XE\DANAN.DBF' size 300M uniform;
  --drop tablespace danan including contents;
  alter user danan quota unlimited on danan;
  alter user danan default TABLESPACE danan;
  select * from v$datafile;