Good Questions vs. Bad Questions Ratio

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Skeptics

Q&A for scientific skepticism

declare @start datetime = '2017-10-08';

with terms as(
  select iif(ClosedDate <= CreationDate+3 
             --and IsClosedAsDuplicate = 0
             , 1, 0) closed,
         iif(DeletionDate <= CreationDate+3, 1, 0) deleted,
         isnull(AnswerCount, 0) answers,
       
       Id PostId
  from PostsWithDeleted
  where PostTypeId = 1  
)

select dateadd(week, datediff(week, @start, CreationDate), @start) week,
       sum(iif(closed = 0 and ((answers > 0 and Score = 0) or Score > 0), 1.0, 0))/sum(iif(closed = 1 or Score < 0, 1.0, 0)) "Good / Bad Ratio"
from terms 
     join PostsWithDeleted 
          on Id = PostId
where PostTypeId = 1
group by dateadd(week, datediff(week, @start, CreationDate), @start)
order by dateadd(week, datediff(week, @start, CreationDate), @start)

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