If you're looking of ways to try out SQL queries to the database without
having to recompile all the GUIDE code, you should know that MS Access
has can do this.  You can type in an SQL query and see the results it
would return.

If you open a database in Access, you see a tab control that has options
such a "tables", "queries", etc.  If you click "queries", and then select
"New Query", and "Design Mode", and then select "View SQL" from the
main Access menu, a box opens up where you can type in SQL queries.
There may already be queries created for the guide.mdb database, so you
can also open those up and view them.  To run the query, you just
click on the query and click "Open".              

I've found that using Access is faster than having to recompile a java
program(even a small one) again and again.  Also, it sometimes can give
you error messages that offer some clue as to what is wrong with your
query.