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

SET STATEMENT max_statement_time=100 FOR 
SELECT Pa.page_title AS article, pl_title AS portal, Ps.page_title AS suggestion
FROM pagelinks
JOIN page Pa ON Pa.page_id=pl_from AND Pa.page_namespace = 0 AND Pa.page_title NOT LIKE "Portal/%"
JOIN templatelinks ON tl_from=pl_from AND tl_title LIKE "Portal%"
LEFT JOIN page Ps ON Ps.page_title LIKE CONCAT(SUBSTR(pl_title,1,3),"%") AND UPPER(Ps.page_title) = UPPER(pl_title)
WHERE pl_namespace=100 AND pl_title NOT LIKE "%/%"
AND NOT EXISTS (SELECT 1 FROM page WHERE page_title=pl_title AND page_namespace=100)
ORDER BY Pa.page_title, pl_title

SQL

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