select count(rev_actor) as No_of_articles

from

    change_tag,change_tag_def,revision,page,actor

where ct_tag_id = ctd_id

    and rev_id=ct_rev_id

    and page_id=rev_page

    and page_namespace=0

    and page_is_redirect=0

    and actor_id=rev_actor

    and ctd_name = "contenttranslation-v2" 

    and rev_parent_id=0

    and substr(rev_timestamp,1,4)>"2019"

    group by actor_name

   order by No_of_articles desc

limit 5