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Hi I am just learning SQL myself, so I don't have an answer for you, but I do have two comments:
- I've never seen that  &  structure in Tableau. I usually see things like UNION ALL between tables.
- The workbook you posted doesn't have any data in it because it is a twb. It needs to be a packaged workbook (twbx) for us to open it.
Hope this helps. (At least it bumped it to the front of the line.)