How to link a database to other?

I was creating an app to show activities to help the environment. People register to participate in the activities and then return to home page. The idea is to see the number of people participating. I have a database for the activities and other for the people participating. But I don’t know how to tell bubble that I want to count the number of people registered in the activity.

You would have a field on “Activity” that is of type “Participants” (or whatever the data type for the people involved is, it might be user or whatever) and click the box that says “this is a list”.

You can then have a text element that says “Activities Participant List:count”. That will count the items in the list for you.

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Thanks for helping me. I do appreciate it.