SharePont 2016: How to make “Creator” column UNIQUE

sharepoint.stackexchange https://sharepoint.stackexchange.com/questions/266346
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Question

I want to enforce unique values for "Created by" column. the "Created By" column unique. When I have to add a new element and an item really exist in the same "Created By" list - it shows an error message.

How to do this?

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No correct solution

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