Authors of articles by category

SQL

SELECT DISTINCT A.actor_name, COUNT(1) as articles
FROM ukwiki_p.revision R
 JOIN ukwiki_p.page P1 ON R.rev_page = P1.page_id
 JOIN ukwiki_p.page P2 ON P1.page_title = P2.page_title
 JOIN ukwiki_p.categorylinks CL ON P2.page_id = CL.cl_from
 JOIN ukwiki_p.actor A ON R.rev_actor = A.actor_id
WHERE R.rev_parent_id = 0
 AND P1.page_namespace = 0
 AND P2.page_namespace = 1
 AND P1.page_is_redirect = 0
 AND CL.cl_to LIKE "Статті_конкурсу_«Європейська_весна_2021»_—_Чехія"
 AND R.rev_timestamp >= 20210401000000
 AND R.rev_timestamp < 20210501000000
GROUP BY A.actor_name
ORDER BY articles DESC
SQL

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