select avg(datediff(hh,closed,opened)) as reopen_after_ho...


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select avg(datediff(hh,closed,opened)) as reopen_after_hours
select po.postid
     , min(ph.creationdate) as closed
     , max(po.creationdate) as opened
from posthistory ph 
inner join posthistory po on po.postid = ph.postid
where ph.posthistorytypeid =10 -- closed
and po.posthistorytypeid =11 -- reopen
and po.creationdate > ph.creationdate -- multiple re-opens/ closes screw up here
group by po.postid
) as co

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