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select avg(len(a.body)) as [Answer body length]
  from posts q
  join posts a
    on q.id = a.parentid
 where q.posttypeid = 1
   and a.posttypeid = 2
   and q.closeddate is null
   and DATEPART(yyyy, q.CreationDate) = 2012
   and a.owneruserid = q.owneruserid
   and datediff(DD, q.CreationDate, a.creationDate) < 1
   and a.score >= 1
   and q.score >= 0
   and not exists ( select 1 
                      from posts
                     where parentid = a.parentid
                       and id <> a.id
                       and score > 0
                       and CreationDate < a.CreationDate
                           )
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