Query a MySql database

Can I query a MySql database with a gravity form and output the data on my website ? Let´s assume the query has produced 3 results. Can I then choose one of those results and have it sent to me by email.
With thanks for your kind help, Ken

It sounds like I could also write to the MySQL database too?
What I would like to do:
1. Replace the form on this NON-wordpress page ( http://pulmccm.org/ccmtutorials/adduser.php ) of my wordpress-based site (http://pulmccm.org) with a wordpress page containing Gravity Forms.
2. Gravity Forms would send the email address the user enters to Aweber, which would send them a double opt-in email, and to the MySQL dbase.
3. The password field will be replaced with a ZIP code field which would be stored in Aweber or in my MySQL dbase, or both.
4. Then, when the user logs in at this location http://pulmccm.org/ccmtutorials/pulmonary-board-review.php , the MySQL dbase is queried to verify login.
Or could I replace this functionality with a Gravity Forms page as well, which would query either the MySQL dbase or the Aweber database itself to verify login?
If I can do all this database querying through Gravity Forms <--- ---> Aweber, I wouldn't need the MySQL dbase in the first place (it's redundant)
Hope this makes sense. Thank you for your help!