Links to absent portals

This query lists template uses such as {{Portal|Foo}} or {{Portal|History|Foo|Science}} where Foo is not a portal nor a redirect to one.  If multiple portals are listed for one article, they usually appear in the same template call.  There will be some false positives, where an article has no such template but links to a portal in another way.  However, no actual portals are listed.  Most should be removed but some can usefully be replaced by similar portals which do exist.  For example, {{Portal|Judaïsme}} obviously attempts to link the actual [[Portal:Judaism]].

SQL

SELECT page_title AS article, pl_title AS portal
FROM pagelinks
JOIN page ON page_id=pl_from AND page_namespace = 0
WHERE pl_namespace=100 AND pl_title NOT LIKE "%/%" AND pl_title NOT LIKE "%_(state)" /* Top level portal */
AND NOT EXISTS (SELECT 1 FROM page WHERE page_title=pl_title AND page_namespace=100) /* Portal is a redlink */
AND EXISTS (SELECT 1 FROM templatelinks WHERE tl_from=pl_from AND tl_target_id IN
            (SELECT lt_id FROM linktarget WHERE lt_title LIKE "Portal%")) /* Article uses {{Portal...}} */
ORDER BY article, portal

SQL

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