b - Quarry

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

SQL

SELECT COUNT(page_title) from
(SELECT page_title,
COUNT(DISTINCT rev_actor) AS usrcnt
FROM revision
JOIN page
ON rev_page = page_id
WHERE page_namespace = 4
AND page_is_redirect = 0
AND page_title NOT LIKE 'Route_diagram%'
GROUP BY page_id
HAVING usrcnt = 1) d;

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