Percent Answered (in SE sites or '% Answered' in Area51 statistics)

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SITE HEALTH VALUE from Area51 statistics -> Percentage Answered (http://area51.stackexchange.com/proposals/42810/stack-overflow-in-spanish) --- Percent Answered in SE sites (http://stackexchange.com/sites#percentanswered) ---- Formula: %Answered = (Accepted + Answer_Has_Positive_Score + Closed) / Questions_Including_Closed ---- Source: http://meta.stackexchange.com/a/86976/304899

Ukrainian Language Meta

Q&A about the site for linguists, teachers and students of the Ukrainian language

WITH Answers AS (
  -- unique answers with best score per question
  SELECT ParentId AS Id, MAX(Score) AS Score
  FROM Posts
  WHERE PostTypeId = 2
  GROUP BY ParentId
)
, Counts AS (
  SELECT
    -- Count for questions joined with answers
    COUNT(*) AS Asked,
    SUM(IIF(Q.AcceptedAnswerId IS NOT NULL AND Q.ClosedDate IS NULL, 1, 0)) AS AcceptedNotClosed,
    SUM(IIF(Q.AcceptedAnswerId IS NULL AND A.Score > 0 AND Q.ClosedDate IS NULL, 1, 0))
      AS PositiveScoreNotAcceptedNotClosed,
    SUM(IIF(Q.ClosedDate IS NULL, 0, 1)) AS Closed
  FROM Posts Q
  LEFT OUTER JOIN Answers A
    ON Q.Id = A.Id
  WHERE Q.PostTypeId = 1
)
  
SELECT 
  Asked, AcceptedNotClosed, PositiveScoreNotAcceptedNotClosed, Closed,
  
  (AcceptedNotClosed + PositiveScoreNotAcceptedNotClosed + Closed) AS Answered,
  (Asked - (AcceptedNotClosed + PositiveScoreNotAcceptedNotClosed + Closed)) AS Unanswered,
  
  Cast(Cast(
    (AcceptedNotClosed + PositiveScoreNotAcceptedNotClosed + Closed)
    / CAST(Asked AS FLOAT)
    *100 as decimal(18,2)
  ) as varchar(5)) + ' %' AS "%Answered"
FROM Counts

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