Hi

What is the best practice to store records which are either related to one 
parent OR to all parents?

Related to one is clear (set parent_id to id), but which method is the 
better approach:

Set parent_id to 0 to make the record available to all parents or set it to 
"null" and make a "global switch" (tinyint 0/1)?

In real life a document can belong to one company OR (not at the same time) 
to all companies.

What would you do?

Thanks,
Frank

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