Add a button for query or search form

Good day, you can add a button to query or search form 

I'm sorry, but I'm not sure if I fully understand the question. Can you explain further? Do you want to send your form submissions to a database just like the original question? If yes, just please follow our steps here:

http://www.jotform.com/help/126-How-to-send-Submissions-to-Your-MySQL-Database-Using-PHP

This is a bit technical, but we can help just in case.

If you want to add as search button in the form that will connect to your external database, unfortunately, it's not possible in the form builder. You will need to do this by getting the form source codes and adding custom codes there for the search function.

https://www.jotform.com/help/104-How-to-get-the-Full-Source-Code-of-your-Form