Unanswered Questions by Tag

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Shows all tags with at least 3000 questions, their total questions and of those, how many are unanswered.

MathOverflow

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-- Unanswered Questions by Tag
-- Shows all tags with at least 3000 questions, their total questions and
-- of those, how many are unanswered.

DECLARE @minQuestionCount int = 3000

SELECT
  *
FROM
  (
    -- All unanswered questions grouped by tag
    SELECT
      t.TagName AS TagName,
      COUNT(1) AS UnansweredCount,
      t.Count AS QuestionCount
      FROM Posts q
      INNER JOIN PostTags pt ON q.Id = pt.PostId
      INNER JOIN Tags t ON pt.TagId = t.Id
      WHERE
        (q.PostTypeId = 1) AND
        (q.ClosedDate IS NULL) AND
        NOT EXISTS
        (
          SELECT *
            FROM Posts a
            WHERE
              (a.ParentId = q.Id) AND
              ((a.Score > 0) OR (a.Id = q.AcceptedAnswerId))
        )
      GROUP BY TagName, t.Count
  ) a
WHERE a.QuestionCount > @minQuestionCount
ORDER BY
    TagName

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