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select dateadd(week,0, datediff(week,0, CreationDate)) week,
       sum(iif(Score < 0, 1.0, 0)) downvoted,
       sum(iif(ClosedDate <= CreationDate+3 
               /*and IsClosedAsDuplicate = 0*/, 
               1.0, 0))/count(*) closed,
       sum(iif(DeletionDate <= CreationDate+3, 1.0, 0))/count(*) deleted
from Posts
where PostTypeId = 1
group by dateadd(week,0, datediff(week,0, CreationDate))
order by dateadd(week,0, datediff(week,0, CreationDate))

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edited oct 27 17

created oct 27 17 Jon "not doe" Ericson