> Thank you for all pablo.

You're welcome.

> So the last problem,
> in the collection of data is to do the translation
> from my gross data to my net data in sql format that
> i'll can exploit with the ibm academic software.
> Maybe, it will appear stupid but what i have to do
> for that? I am open to read everything around the
> subject.

I think we're probably a bit out of topic ... :) ... I'd suggest looking at
Hadoop.  It may offer what you're after and you might be able to avoid using
SQL.

Good luck!

-pablo