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List of users with at least 2 zero-score accepted answers, sorted by ratio of zero to non zero score

Q&A for developers and researchers interested in open data

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select X.*, u.Reputation from (
  select a.OwnerUserId [User Link], 
    sum(case when a.Score = 0 then 0 else 1 end) as [Non Zero Score Answers],  
    sum(case when a.Score = 0 then 1 else 0 end) as [Zero Score Answers],
    ROUND(avg(case when a.Score = 0 then 100.0 else 0.0 end), -1) as Percentage
  from Posts q
  join Posts a on a.Id = q.AcceptedAnswerId 
  where a.CommunityOwnedDate is null and a.OwnerUserId is not null
    and a.OwnerUserId <> isnull(q.OwnerUserId,-1)
  group by a.OwnerUserId
  having sum(case when a.Score = 0 then 1 else 0 end) > 1
) as X 
join Users u on u.Id = [User Link]
order by x.Percentage desc

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edited feb 17 13 badp

created jul 8 10 sam.saffron