Yes, that's a function of older data and can happen in cases where users are being moved around (renamed, deleted, directories etc)
This is one of many reasons that you should not be reading the database. It's not built for reporting.
Thanks for the answer. Can you suggest somethink that will be usable for reporting?
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Use the API - internal if you're on server and happy to code in there, or REST if you are on Cloud, or don't want to code internally. Or take a look in the marketplace for add-ons that can do what you want to report on.
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