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The Join Features tool seems to have worked: Steps: Add a feature layer to a web map by using the Join Features tool. Note: I couldn't find the Content --> Analysis button in the new Web Map Viewer (Beta). I had to use the classic Web Map Viewer instead. Create an application to authorize HTTP requests to AGOL Query an ArcGIS Online FC via an HTTP ...


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I'd say join field is the tool you need. To test it I created 3 identical tables named "A","B","C": after running this script: import arcpy for i,letter in enumerate("ABC"): if i==0: first = letter else: arcpy.AddMessage("Joining %s to %s" %(letter,first)) arcpy.management....


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You did create a join, not a relation. Joins and a relations are different things. A join (layer based) does add attributes from another layer based on a 1:1 or 1:0 cardinality relationship, but in the described case you have a 1:n relationship (1 project : n trees). The behavior you need can be achieved via Project > Properties... > Relations. Add a ...


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