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I guess one or more column names in your select list exists in more than one table of the FROM list. Just prefix every column in the SELECT list with the table it's coming from and check.
Run your SQL code in a query tool like TOAD before you run it in Tableau and make sure it works there.
You're likely going to need SQL support, not Tableau support which will probably be better on Stackoverflow for example.
This helped, thank you!