comments per post

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declare @endDate date;
select @endDate = max(creationdate) from comments;
declare @daysPerBin int= ##daysPerBin?7##;

select d,cast(sum(numComments) as float) / count(postId) as meanComments
from
(select dateadd(day,
@daysPerBin * (datediff(day, @endDate, max(p.creationdate))/@daysPerBin),
  @endDate) as d,count(c.id) as numComments,p.id as postId
from posts p
join comments c
on p.id = c.postid
group by p.id) as x
group by d
order by d asc

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