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Q&A about the site for gardeners and landscapers

select
  dateadd(month, datediff(month, 0, CreationDate), 0) as Mnth,
  avg(datediff(mi, CreationDate, ClosedDate)) as AvgTimeToClose
from PostsWithDeleted
where ClosedDate is not null
  and tags like '%identify%'
group by dateadd(month, datediff(month, 0, CreationDate), 0)
order by dateadd(month, datediff(month, 0, CreationDate), 0)

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edited oct 19 17

created oct 19 17 David.Forck