[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 rd.page_title, rd_namespace, rd_title
FROM redirect
JOIN page rd ON rd_from = rd.page_id
LEFT JOIN page target ON target.page_namespace = rd_namespace AND target.page_title = rd_title
WHERE
	rd.page_namespace = 0
    AND target.page_id IS NULL
    AND rd_interwiki = ""
    AND rd_namespace >= 0

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SQL

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