How do I change the "Allowed to view" option for all users in my DB

How do I change the "Allowed to view" option for all users in my DB

Hi,

I have over 9000 users in the DB that are linked to a department / Site. I woud like to allow all of them to view all tickets under that site / department. How can I do this in the DB without having to update 9000 users individually from the GUI. 

thanks,
Robert

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