nlwiki Red article links w/ rare title suffixes between parenthesis

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

(just suffixes w/ lowercase letters for now)
1. count all suffixes in article links
2. get red article links with a suffix
3. join and select rare suffixes (currently: that occur only once)

takes 15-20 mins

https://nl.wikipedia.org/wiki/Gebruiker:Bdijkstra/quarry/Haakjesanomalieën

SQL

SELECT REGEXP_REPLACE(pl_title, '_\\(([^\\(\\)]+)\\)$', '\\1')
FROM pagelinks
WHERE
	#NOT EXISTS (SELECT * FROM page WHERE pl_title=page_title AND page_namespace=0) AND
	/*pl_from_namespace=0 AND pl_namespace=0 AND*/ pl_title REGEXP '_\\([^\\(\\)]+\\)$'
LIMIT 10

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