nlwiki Anomalous sort key for main article of category

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

SQL

USE nlwiki_p;
SELECT 
	CONCAT('[[:', CONVERT(REPLACE(a.page_title,'_',' ') USING UTF8MB4), ']]') AS title, 
	CONVERT(cl_sortkey_prefix USING UTF8MB4) AS sortkey,
    LENGTH(cl_sortkey_prefix) AS 'strlen(sortkey)'
FROM (page a, page c) LEFT JOIN categorylinks ON (a.page_id=cl_from AND c.page_title=cl_to)
WHERE
	a.page_namespace=0 AND
	c.page_namespace=14 AND
	a.page_title=c.page_title
HAVING BINARY(sortkey)='' OR LEFT(sortkey, 1) NOT IN (' ', '*')
LIMIT 25

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