Hello, Marco!

Thursday, November 14, 2013, 6:57:56 PM, you wrote:

MS> Dear friends please I need your help, thank for your information.

you may split Firebird database any way you want.
But, constraints are enforced only inside one database file.

So, you may put one table in one database, and other table to second
database, but you cannot "link" them.

If you want to query one database inside another - read about
execute statement on external. Of course, you may transfer data
between databases via your application.
You may connect to as many databases as you wish.

--
Dmitry Kuzmenko, www.ib-aid.com