nlwiki Probably missing category sort key

SQL

USE nlwiki_p;
SELECT 
	page_namespace AS ns, 
    page_title, 
    page_is_redirect AS rd,
    REPLACE(REGEXP_REPLACE(page_title, '_\\(.*\\)$', ''),'_',' ') AS name, 
    cf.cl_to AS cat, 
    cf.commas
FROM page, (
	# fraction of pages in a category having a comma in the sortkey
	SELECT cl_to, (COUNT(*) / (cat_pages-cat_subcats)) AS commas
	FROM categorylinks, category
	WHERE 
  		cat_title NOT REGEXP '^(Adel_|Wikipedia:)|(bisschop|club)$' AND
		cl_to=cat_title AND
		cl_sortkey_prefix REGEXP ','
	GROUP BY cl_to
	HAVING commas > 0.9 AND commas < 1) cf, categorylinks cl
WHERE 
	page_id=cl.cl_from AND
    page_title NOT REGEXP '^Paus_|_Brothers$' AND
	page_title REGEXP '^\\p{L}+(_\\p{L}+)+(_\\(.+\\))?$' AND
    page_title NOT REGEXP '^\\p{L}+_[IVX]+_(der|van)_\\p{L}+$' AND
    page_title NOT REGEXP '^\\p{L}+(_\\p{L}+)*_(en|and)_\\p{L}+(_\\p{L}+)*$' AND
	cl.cl_to=cf.cl_to AND 
	cl.cl_sortkey_prefix=''
ORDER BY page_latest DESC
SQL

Checking query status...
