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if you extract the data you should be able to use countd. I know that is true of Excel also, because Excel does not support a countd function, but the data extracted into Tableau will allow use of it.
What exactly do you mean by extract data?
If you right click on the data source, a drop down menu appears and about half way down that drop down menu is a selection for Extract data (double disc symbol). This will bring all the data inside the workbook rather than being live connected to the database itself.