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In the latest version of tableau, it support combination of polygons and dots in same map, the version is 2018.1.
Below is the steps I did to get the result
1st, full out join your data to shape file
2nd, use dual axis to combine the polygon and dots
I attached workbook with 2018.1 in case you can open it with latest version
Hope this helps
This is great!
But actually my actual data doesn't have any key to join the data.
So I thought of adding the attributes from polygon to the points and then do spatial join.
And it works!
Thanks a lot and have a great day!