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How long between a question is asked, and the answer arrives....

Q&A for peer programmer code reviews

-- measure from the answer time, not the question time.
-- this implies certain things, more to follow.

declare @history as int = - ##Weeks:int?60##
declare @zombie as int = ##Zombie:int?30##
;

with QandA as (
    select p.Id,
           p.CreationDate as QDate,
           min(a.CreationDate) as ADate
    from Posts p,
         Posts a
    where p.Id = a.ParentId
      and p.PostTypeId = 1
      and a.PostTypeId = 2
      and a.ClosedDate is null
      and p.closedDate is null
      and a.CreationDate >= convert(Date, DateAdd(week, @history, CURRENT_TIMESTAMP))
    group by p.Id, p.CreationDate
), AnswerDelays as (

    select DATEADD(DAY, 7 - DATEPART(WEEKDAY, CONVERT(DATE,ADate)), 
                   CONVERT(DATE,ADate)) as WeekEnd,
           convert (Decimal(8,2), DateDiff(minute, QDate, ADate)
                   / Convert(float, 60)) as Delay
    from QandA
   )
   
select WeekEnd as WeekEnd,
       Avg(Delay) as AnswerDelay,
       Stdev(Delay) as StdDev,
       Count(*) as AnswerCount
from AnswerDelays
where Delay < (@zombie * 1440)
  and WeekEnd < CURRENT_TIMESTAMP
group by WeekEnd 


--select count (*) from QandA

view current version

edited feb 26 14

created feb 26 14 rolfl