I am trying to add a relate between 2 feature classes so that I can use the area of the related table to update a field in the original table.
I found that ArcGIS Pro (http://pro.arcgis.com/en/pro-app/tool-reference/data-management/add-relate.htm) can do this, but a similar feature is not available to ArcPy when used with the ArcGIS 10.3 environment i.e. I am not using ArcGIS Pro.
I followed the script at the bottom of the ArcGIS Pro help page for Add Relate (believing that they would be the same), but get the error that the module has no attribute 'AddRelate'. This confirms the result seen in Terminology for distinguishing ArcPy installed with ArcGIS 10.x for Desktop from that which comes with ArcGIS Pro?
I am aware of the CreateRelationshipClass_management tool, but don't know if this the same thing and if it is, how to call a related field after establishing the relationship.
Can anyone either explain the CreateRelationshipClass tool better (I can't seem to understand the help documents) or explain how to better relate two tables so that I can access another column?
I did try joining the tables, but I can't get them to unjoin afterwards and I don't want the additional fields actually in my table.