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Q&A about the site for people interested in the history and origins of science and mathematics

select 
postid, count(1)
from 
  comments c 
where 
  c.creationdate = (
    select 
      max(c2.creationdate) 
    from 
      comments c2 
    where 
      c2.postid = c.postid
  )
  group by postid
  having count(1) > 1

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edited dec 4

created dec 4 Janis123