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select geo_estacion_metro.*, agg_pob.poblacion
from geo_estacion_metro
join
	(select id_metro, nombreesta, sum("POB1") as poblacion
	from
		(select m.id as id_manzana, m."POB1", buffer.id as id_metro, buffer.nombreesta
			from manzanas_zmv as m
			join (select id, nombreesta, st_buffer(geom, 500) as geom
			from geo_estacion_metro) as buffer
			on st_intersects(m.geom, buffer.geom)) as pob_metro
	group by id_metro, nombreesta) as agg_pob
on geo_estacion_metro.id = agg_pob.id_metro