find invalid ISO:3166-2 codes (dewiki)

This query is marked as a draft This query has been published by Herzi Pinki.

queries table geo-tags for non matching pairs of iso:3166-1 and iso:3166-2 codes. Does not check for false iso:3166-1 codes.

SQL

use dewiki_p;
describe geo_tags;
#select gt_country,gt_region,count(*) from geo_tags where gt_region is null group by gt_country,gt_region having count(*) > 100 order by 3 desc;

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