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SELECT 
  YEAR(q.CreationDate) AS year,
  COUNT(CASE WHEN a.AcceptedAnswerId IS NULL THEN 1 END) AS unaccepted_answers_count
FROM 
  Posts q
LEFT JOIN 
  Posts a ON q.Id = a.ParentId
WHERE 
  q.PostTypeId = 1 -- Question
GROUP BY 
  YEAR(q.CreationDate)
order by
  YEAR(q.CreationDate)

fork query

edited apr 23 23

created apr 23 23 jon.doe32071