Distribution of score aquired as function of age for questions and answers

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Aviation

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With a as
(
   Select 
   p.Id,
   cast(DATEPART(YYYY, p.CreationDate) as char) TimeYr, 
   p.PostTypeId,
   p.Score,
   case when VoteTypeId = 2 then 1.00 
        when VoteTypeId = 3 then -1.00 else 0.00 end VoteS,
   round(1.00*DATEDIFF(day, p.CreationDate, v.CreationDate)/30,0) delay
   from Votes v 
   join Posts p 
   on p.Id = v.PostId 
   where p.PostTypeId in (1,2) and VoteTypeId in (2,3)
), c as 
(
   Select TimeYr, count(distinct Id) nyear from a
   where PostTypeId = 1 
   group by TimeYr
), d as
(
   Select
   delay, TimeYr,  
   SUM(VoteS) sumscore
   from a
   where PostTypeId = 1 
         and delay <= 36
         and Cast(TimeYr as int) in (2010,2011,2012,2015)
   group by delay,TimeYr
)


Select 
d.delay, d.TimeYr, (d.sumscore/c.nyear)
from d join c on d.TimeYr = c.TimeYr
order by d.TimeYr, d.delay

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