Database schema visualisation: modules

I would like to show only single "module"/bunch of related tables in the database. If I have a lot of tables, it makes diagram view of database quite useless. There is option to see connected tables of one table, but it shows all connected classes which are pretty often everything.

I sugest this: group tables by prefix (by underscore or uppercased letters) and let user choose which “module” wants to see. And let him see only this tables (something_*) in full view. Related tables by FK outside of module show only as stubs/names, but not theirs dependencies.

It would be very beneficial for orientation in huge databases.