A question that is bad enough to be closed is a candidate for deletion.
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-- Percentage of closed but not deleted questions -- A question that is bad enough to be closed is a candidate for deletion. select Year(creationdate) as [Year], Month(creationdate) as [Month], count(id) as [Posted], sum(case when closeddate is null then 0 else 1 end) as [Closed but not deleted], round(100.0*sum(case when closeddate is null then 0 else 1 end)/count(id),2) as [Percent] from posts where posttypeid = 1 group by Year(creationdate), Month(creationdate) order by Year(creationdate), Month(creationdate);