How many answers come from people who don't contribute regularly?

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select --top 100 *, datediff(day, p.CreationDate, u.LastAccessDate)
       --min(p.CreationDate), max(p.CreationDate), max(u.LastAccessDate),
       case
         when datediff(day, u.CreationDate, u.LastAccessDate) > ##cutoff?30##
              and datediff(day, u.CreationDate, p.CreationDate) > ##cutoff##
         then 'Regular'
         else 'Drive by'
       end user_type,
       --round(avg(Score*1.0), 2) avg_score,   
       count(*) answers
from Posts p
     join Users u on u.Id = OwnerUserId
where p.PostTypeId = 2
      and datediff(day, p.CreationDate, getdate()) 
          between ##cutoff## and 365 + ##cutoff##
      and Score > 0
group by case
           when datediff(day, u.CreationDate, u.LastAccessDate) > ##cutoff## 
                and datediff(day, u.CreationDate, p.CreationDate) > ##cutoff##
           then 'Regular'
           else 'Drive by'
         end
         order by count(*) desc

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