Unique values for primary key column

Is it possible to enforce unique values for a primary key column.
Our customer codes are a unique alphanumeric value. I want to keep from entering the same customer code in my customer sheet.

Welcome to the community, @Ben_Harm

Yes, this is a great question. We don’t have the ability currently.
a) ability to dedupe duplicate rows , and
b) tooling to warn users are they are entering duplicate data, and
c) tooling to spot duplicate row etc…

are in our medium to long-term roadmap.
We will update in community as we make progress.