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May I know what are the usages of Community Nickname and Alias fields? Where are they used effectively?

Also, Community Nickname is unique but not Alias. Thus, 2 users can have the same alias. Is there any reason why Alias is also not unique?

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According to the Salesforce documentation on User fields:

Alias: Short name to identify user on list pages, reports, and other pages where the entire name does not fit. Up to eight characters are allowed in this field.

Community Nickname: Name used to identify this user in a community. Up to 40 alphanumeric characters are allowed; standard users can edit this field.

I can't answer why Alias is not unique, but I personally think it is an oversight and keep them unique in my org.

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