Count of Wikidata items being not in use

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

SQL

USE wikidatawiki_p;
SELECT COUNT(*)
	FROM (SELECT * FROM page WHERE page_is_redirect = 0 AND page_namespace = 0) AS page
	LEFT JOIN (SELECT * FROM pagelinks WHERE pl_namespace = 0 AND (pl_from_namespace = 0 OR pl_from_namespace = 120)) AS links
		ON pl_title = page_title
WHERE pl_from IS NULL
GROUP BY page_id;

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