SQL
x
USE commonswiki_p;
SELECT /* SLOW_OK */
YEAR(image.img_timestamp) as "Year",
COUNT(page.page_title) AS NbUploads
FROM image
CROSS JOIN page ON image.img_name = page.page_title
CROSS JOIN categorylinks ON page.page_id = categorylinks.cl_from
WHERE
categorylinks.cl_to = "Supported_by_Projet_Phoebus"
GROUP BY YEAR(image.img_timestamp)
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