Populate Dropdown list using SQL query

Can I do a SQL query from a database to make a dropdown menu?

You can achieve this by using the full source code of the form and then create your own custom SQL query script that will populate the Dropdown list field.

This process will require custom programming on your part (the SQL query data injection code)

Here is a similar discussion thread you can review

https://www.jotform.com/answers/369587-How-do-I-populate-a-dropdown-menu-with-items-from-a-Google-Sheet

Although in that discussion the source data is from a google spreadsheet. But the concept is very much the same to what you need.

Hope this help. Let us know how we can be of further assistance.