[enwn] Broken mainspace redirects

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

List all broken mainspace redirects.
Happens when a user renames a page, from [[Foo]] to [[Bar]] and [[Bar]] is abandoned and deleted and [[Foo]] isn't.

Adapted from AntiComposite's https://quarry.wmflabs.org/query/50407

SQL

USE enwikinews_p;

SELECT * FROM page
WHERE page_namespace, page_title IN
(
SELECT rd_namespace, rd_title
FROM redirect
JOIN page ON redirect.rd_from = page.page_id
WHERE page_title IN
	(
    	SELECT page_title
      	FROM page
      	WHERE page_namespace = 0
      	AND page_is_redirect = 1
	    AND page_title = "Foo"
    )
)
;

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SQL

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