I have 5000 users in my moodle. Each user should be assigned to a role at the system level, and only that one role.
Is there an easy way to see if any user is in more than one role?
Wow, 5K system level users. We wouldn't do that because they show up in every course.
The structure of your Moodle must be very interesting and unique.
I think, if I were trying to find more than one role, I'd use bulk download of users and then an Access query.
That's exactly what I ended up doing!