SQL
AخA
SELECT DISTINCT I.img_name, I.img_timestamp, U.user_name
FROM commonswiki_p.image I
LEFT JOIN commonswiki_p.page P ON I.img_name=P.page_title
LEFT JOIN commonswiki_p.categorylinks CL ON P.page_id=CL.cl_from
LEFT JOIN commonswiki_p.actor A ON I.img_actor=A.actor_id
LEFT JOIN commonswiki_p.user U ON A.actor_user=U.user_id
WHERE I.img_timestamp > 20191020000000
AND P.page_namespace = 6
AND CL.cl_to LIKE "WikiConference_2019%"
ORDER BY I.img_timestamp DESC
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