SQL
AخA
use cswiki_p;
select left(rev_timestamp, 6), regexp_replace(page_title, "/.*", "") as mentor, count(*)
from change_tag join revision on rev_id=ct_rev_id join page on rev_page=page_id
where
ct_tag_id=(select ctd_id from change_tag_def where ctd_name="mentorship module question") and
left(rev_timestamp, 4)="2020" and
group by regexp_replace(page_title, "/.*", ""), left(rev_timestamp, 6);
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