nlwiki Articles without content category

Pages without any categories or with only maintenance categories.

Query breakdown:
1. outer query = a list of article pages that are not nominated for deletion and older than 24 hours
2. hc = a list of maintenance categories, meaning the titles of category pages with the __HIDDENCAT__ or __EXPECTUNUSEDCATEGORY__ property
    note: could filter out empty categories using the `category` table
3. nhcl = take `categorylinks`, filter out hc and collapse to a single row per page
4. final result = get the titles of article pages not present in nhcl, and the creation timestamp

Takes about 30s to execute on nlwiki.

SQL

USE nlwiki_p;
SELECT page_title, rev_timestamp
FROM (
  	# recent bewerkte artikelen die niet genomineerd zijn en ouder dan 24 uur
	SELECT DISTINCT page_id, page_title, rev_timestamp
	FROM recentchanges, page, revision
	WHERE 
  		page_id=rc_cur_id AND
		page_namespace=0 AND 
  		page_is_redirect=0 AND
  		NOT EXISTS (
          	SELECT * 
          	FROM page_props 
          	WHERE page_id=pp_page AND pp_propname='disambiguation'
        ) AND
  		NOT EXISTS (
          	SELECT * 
          	FROM categorylinks 
          	WHERE page_id=cl_from AND cl_to REGEXP '^Wikipedia:(Verwijderbaar/[0-9]{2}|Nog_niet_gereed|Nuweg)$'
        ) AND
    	page_id=rev_page AND 
  		rev_parent_id=0 AND 
  		UNIX_TIMESTAMP()-UNIX_TIMESTAMP(STR_TO_DATE(rev_timestamp,'%Y%m%d%H%i%s'))>86400
) articles
WHERE 
	NOT EXISTS (SELECT * FROM (
		# niet-beheer categorylinks
		SELECT cl_from, cl_to FROM categorylinks WHERE 
      		cl_to NOT REGEXP '^(Diersoort_beschreven_in_|Actuele_(sport)?gebeurtenis$)' AND
            NOT EXISTS (SELECT * FROM (
                # beheercategorieën
                SELECT DISTINCT page_title
                FROM page, page_props
				WHERE page_namespace=14 AND page_id=pp_page AND (pp_propname='hiddencat' OR pp_propname='expectunusedcategory')
            ) hc WHERE cl_to=hc.page_title)
		GROUP BY cl_from
		ORDER BY cl_from
	) nhcl WHERE nhcl.cl_from=page_id)
  	ORDER BY rev_timestamp

SQL

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