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select geometry from osm_admin WHERE admin_level = 2 and name = 'Российская Федерация' - всё уже есть, говорю же )AB
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with rf as (select geometry from osm_admin WHERE admin_level = 2 and name = 'Российская Федерация')
select osm_id, way
from osm_line, rf
where st_within(osm_line.way, rf.geometry)
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