[SalesForce] Can community user query internal users of salesforce

I am running a trigger whenever a contact is edited. In trigger I am querying user 

[Select id from user]

I am getting all the users when trigger in run in any internal user context. But when same trigger is run in community user context I am getting only community member. Is this known behaviour or I am doing something wrong. Is there any Knowledge article for this?

I have found a similar question here :-
Can community users reference internal users in Chatter?

Best Answer

You can refer Determine User Visibility in Your Community

User sharing lets you decide whether all users in a community are visible to each other.

User sharing for external users is turned on by default when you enable Communities. This setting applies to all communities in your organization.

The default setting allows an external user to see other external users under the same account and users in common communities. You can change the organization-wide default for Users to make your communities more restrictive or open, depending on your use case.

If the you deselect Community User Visibility, external users can’t see each other. For example, John and Sally are external users. John can’t:

  • Search for Sally
  • Find Sally in the community People tab, even if Sally is a member of the community
  • Add Sally to a group
  • Share a file or record with Sally

If John and Sally are members of the same group or share the same record, then they can see each other’s conversations and updates within the group or on the record, but nobody else.

If Sally belongs to the same account as John, and John has delegated external user administration privileges, then John can see Sally. Delegated External User Administration takes priority over user sharing.

So, your SOQL query returns the list of users based on above mentioned settings.

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