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with posts_no_comments as (
select
  count(a.Id) no_comment_total
from
  Posts a
left join
  Comments b on a.Id = PostId
where
  b.PostId is null
)
  
, total_posts as (
select
  count(a.Id) total_posts
from
  Posts a
)  

SELECT
  (no_comment_total * 100.0 / total_posts) AS no_comment_percentage
FROM
  posts_no_comments
CROSS JOIN
  total_posts

fork query

edited oct 29

created oct 29 anonymous