Hey there!
Working on my company Data Explorer queries and some of them do not have the author (Created by column is empty). How those queries could have been created and by who? Thanks for any help on that front!
Can you give an example of such a query?
If the site is relatively old, it is possible that the queries were added before we started displaying the author field on the list 
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For example: User Participation, Adhoc User Participation. Might be it @rishabh!