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with comment_count as (
select 
  UserId
  ,count(Id) count_comments
from 
  Comments
group by
  UserId
)
  
, post_count as (
select
  OwnerUserId
  ,count(a.id) count_posts
from 
  Posts a
group by
  OwnerUserId
)

select
  coalesce(a.OwnerUserId, UserId) UserId
  ,count_posts + count_comments as total_count
from
  post_count a
full join
  comment_count b on a.OwnerUserId = b.UserId

fork query

edited oct 28

created oct 28 anonymous