Can you provide a better piece of data in excel?
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So when you connect to your database, or any data-source in Tableau...it brings up this screen showing the columns
Here you should be able to change the Meta-data for that field. It probably set to Number (Whole), but if you change to Number (Decimal), that should do the trick. Whenever you refresh from that data (or save as a saved datasource) this meta-data definition is included so it will, now , always bring it back as a decimal.
That did the trick. Thank You Simon