Free Oracle only for testing sql scripts

[fcastrog]

Hello!:
Does anybody know about a free oracle server in internet available for testing your sql scripts?

For example:
I want to test the next code...
select translate('123grg','3','6') from dual;

Or...

create table Example(field varchar2(100));
insert into Example values ('123grg');
commit;
select translate(field,'3','6') from example;

Only for temporal testing...
Thanks