Viewcount Averges

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DECLARE @MedianViewCount  int 


SELECT @MedianViewCount =  AVG(ViewCount) FROM
(
SELECT
    ROW_NUMBER() Over (ORDER BY VIEWCOUNT ASC) RN_A,
    ROW_NUMBER() Over (ORDER BY VIEWCOUNT DESC) RN_D,
    ViewCount
FROM
  posts
WHERE 
postTypeID= 1) t
WHERE
   RN_A IN (RN_D, RN_D - 1, RN_D + 1)
  


SELECT 
   AVG(cast(ViewCount as decimal)) Mean_ViewCount,
   @MedianViewCount Median_ViewCount,
   STDEV(cast(ViewCount as decimal)) StandardDevation_ViewCount
FROM
  posts
WHERE 
  postTypeID=  1

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