I hope that you can help me with the following problem: I have a vector (polygon) layer. I would like to add an attribute to the layer that - for every polygon - sums the values of a specific field of all its neighboring polygons.
To give a more concrete example: I have a polygon layer of districts containing information on population. Now, for every district I would like to know how many people live in all its neighboring districts.
As I have more than 300 districts I cannot do this by hand for each and every district.
Is there any way do this more efficiently in QGIS?
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