nlwiki Unsourced statements by year

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

SQL

USE nlwiki_p;
SELECT 
	REGEXP_REPLACE(cl_to, '^Wikipedia:Artikel_mist_referentie_sinds_[a-z]+_(2[0-9]{3})$', '\\1') AS year
FROM categorylinks
WHERE cl_to REGEXP 'Wikipedia:Artikel_mist_referentie_sinds_'
GROUP BY year

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