Historical question grades by week

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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,
       
       Id PostId
  from PostsWithDeleted
  where PostTypeId = 1
  
)

select dateadd(week, datediff(week, @start, CreationDate), @start) week,
       sum(iif(closed = 1 or Score < 0, 100.0, 0))/count(*) bad,
       sum(iif(Score = 0 and AnswerCount = 0 and closed = 0, 100.0, 0))/count(*) neutral,
       sum(iif((AnswerCount > 0 and Score = 0) or Score > 0, 100.0, 0))/count(*) good,
       sum(iif(closed = 1 or Score < 0 or deleted = 1, 100.0, 0))/count(*) bad_deleted,
       sum(iif(Score < 0, 100.0, 0))/count(*) downvoted,
       sum(iif(closed = 1, 100.0, 0))/count(*) closed,
       sum(iif(deleted = 1, 100.0, 0))/count(*) deleted,
       sum(iif(AnswerCount > 0, 100.0, 0))/count(*) answered       
       
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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