I see that some admin codes have the value "00", I am just wondering if this is at all significant or whether I can treat it as a NULL value?
select count(*) from geonames where admin1_code = '00';
select count(*) from geonames where admin2_code = '00';
It's interfering with some algorithms I am writing so would be great to ignore it or understand it better!
Any help gratefully received!