Number of Wikimedia Commons files under CC 4.0 licenses

This query is marked as a draft This query has been published by Guillaume (WMF).

https://meta.wikimedia.org/wiki/State_of_the_Commons/2015

SQL

use commonswiki_p;
SELECT count(page_title)
    FROM page, image
    WHERE page.page_namespace = 6
        AND page.page_title = image.img_name
        AND page_id IN (
            SELECT DISTINCT(cl_from) FROM categorylinks
                    WHERE categorylinks.cl_to LIKE 'CC-%4.0%'
            );

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SQL

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