In a layer I have, e.g., a map of a number of areas of a country. Each area has a row in the attribute table and a associated polygon. Each area also has a number of fields with numerical values. Is there a way to merge the areas based on a field value and sum the respective values of another field? Like dissolve but instead just replacing fields of the merged polygons, I would like to sum them up. I guess this operation must be applicable in a number of cases, maybe when summing up inhabitants in different areas but with the same zip code. However, I can't find a way to do it.
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