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Q&A for people interested in the history and origins of science and mathematics

-- Percentage of closed but not deleted questions

select
  Year(creationdate) as [Year], Month(creationdate) as [Month],
  sum(case when closeddate is null then 0 else 1 end) as [Closed],
  count(id) as [Total],
  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);

fork query

created jan 1 11 sth