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You can do it via the geography type, using a geography index, or via the geometry type with some math to adjust for distortions in mercator. With geography: CREATE INDEX gb1900_geog_idx ON gb1900 USING GIST (geography(the_geom)); CREATE TABLE newtable AS WITH c AS ( SELECT a.cartodb_id, count(*) FROM gb1900 a, gb1900 b WHERE ...



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