DPLA IDs needing institutions

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

SQL

SELECT COUNT(P.page_title) AS Files, CONCAT('https://dp.la/item/', REGEXP_REPLACE(REGEXP_REPLACE(P.page_title, '^.*DPLA_-_', ''), '[\.|_].*$', '')) AS DPLA_id
FROM commonswiki_p.page P
 JOIN commonswiki_p.categorylinks CL ON P.page_id = CL.cl_from
WHERE CL.cl_to = "Media_contributed_by_the_Digital_Public_Library_of_America_with_unknown_institution"
GROUP BY DPLA_id
ORDER BY Files DESC

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