I think you’re talking about custom user profile fields rather than the Database activity - but apologies if I’m wrong.
See https://docs.moodle.org/38/en/User_profile_fields
If it IS the database activity you’re wanting to do this in, then you need to vote for MDL-58680 and MDL-17223 and then you’ll be able to have fields that can be read only, write only, or both to specific roles using a filter.
See https://docs.moodle.org/38/en/User_profile_fields
If it IS the database activity you’re wanting to do this in, then you need to vote for MDL-58680 and MDL-17223 and then you’ll be able to have fields that can be read only, write only, or both to specific roles using a filter.