Can you brief a little about your question. Do you mean how to use the 'Join' in tableau data source. If so then you use the Join option to retrieve data from 2 tables with a common column. Ex: Emp deptid,Dept deptid .You can find options to add/edit table info under data file menu,add new tables,define join type(Simple,Left,Right or Outer Join) and save data source. Please let me know if this helped you.
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