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COUNT(*) AS NumPosts,
ROUND((100.0 * COUNT(*)) / SUM(COUNT(*)) OVER (), 2) AS PercentPosts
WHEN AnswerCount = 0 THEN 'No'
END AS HasAnswer,
WHEN DeletionDate IS NULL THEN 'Deleted'
WHEN ClosedDate IS NULL THEN 'Closed'
END AS State
WHERE Posts.PostTypeId = 1 -- Questions
) AS x
GROUP BY HasAnswer, State