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DECLARE @UserId int = ##UserId##
DECLARE @AnswerPostTypeId int = 2

SELECT 
     (ROUND(
            CAST(Count(answer.Id) AS float) / (SELECT Count(*) 
            FROM Posts 
            WHERE OwnerUserId = @UserId AND PostTypeId = @AnswerPostTypeId
           ) * 100
         , 2
         )
     )  
    AS Accepted_Answers_Percentage
FROM
    Posts question
  INNER JOIN
    Posts answer ON question.AcceptedAnswerId = answer.Id
WHERE
    answer.OwnerUserId = @UserId
  AND
    answer.PostTypeId = @AnswerPostTypeId

fork query

created aug 25 Maciej Kowalski