User type of field mapping table

Hi, When I query Part table, I get GUIDs of Assigned Creator and Designated User (User type fields) from owned_by_id and managed_by_id columns respectively. I need to convert these GUIDs into actual user name value, so I queried innovator.User table with Id = Guid as condition, but I dont find any row related to that Guid. I also tried with config_id = Guid in User table but still same problem. Should I use some other table to get the actual user name?? I guess ARAS Innovator stores User details in innovator.User table.   Thanks.