Number of distinct contributors to AfDs on FA WP each month

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

SQL

use fawiki_p;
select yrmn, count(*)
from
(
select distinct rev_user_text, left(rev_timestamp, 6) yrmn
from revision
join page
on rev_page = page_id
and page_title like 'نظرخواهی_برای_حذف/%'
where rev_timestamp > '20160101000000'
and page_namespace = 4
) contributors
group by yrmn
order by yrmn

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