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With 
members as (
   select u.Id as Id, 
          min(p.CreationDate) as FirstPostDate
   from Users u join Posts p
   on u.id = p.OwnerUserId
   where DATEDIFF(hh, '2012/01/01 00:00', u.CreationDate) > 0
   group by u.Id
),
posttimes as (
   select m.Id,
          p.Score,
          DATEDIFF(hh, m.FirstPostDate, p.CreationDate) as timediff  
   from members m join Posts p
   on m.Id = p.OwnerUserId
),
sumtimes as (
   select Id,
          sum(case when timediff =0 then 1 else 0 end) firstHourPosts,
          sum(case when timediff <=23 then 1 else 0 end) firstDayPosts,
          sum(case when timediff <=167 then 1 else 0 end) firstWeekPosts
   from posttimes
   group by Id
)



select  s.firstWeekPosts,
        count(u.Id)       as nTot,
        sum(case when u.Reputation < 100 then 1 else 0 end) as nLow,
        sum(case when u.Reputation > 2000 then 1 else 0 end) as nHigh
from sumtimes s join users u
on s.Id = u.Id
group by s.firstWeekPosts

fork query

edited dec 13

created dec 13 anonymous