Yes, you can make a join of two tables by calculated field, just first you have to create cleaning step and their to create the calculation and after that to make join step.
thank you , i am very new to this tableau prep how do i do the first step?
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After you open the data source, drag the desired sheet (table) in the flow pain (the upper side of your screen), click on "+" sign (on the right side), and choose "Add Step" or "Insert Step" if you already have inserted other steps. There you have to click on the button "Crate calculated field". Calculations are same as in Tableau Desktop.
At the end do the join step.
I hope it will help you!
I would like to recommend you to watch Tableau Prep video lessons:
thank you let me try this