จำนวนเหรียญสูงสุดของแต่ละประเทศในแต่ละปี

WITH Country_Medals AS (
  SELECT
    Year, Country, COUNT(*) AS Medals
  FROM Summer_Medals
  WHERE
    Country IN ('CHN', 'KOR', 'JPN')
    AND Medal = 'Gold' AND Year >= 2000
  GROUP BY Year, Country)

SELECT
  -- Return the max medals earned so far per country
  ___,
  ___,
  ___,
  ___ OVER (PARTITION BY ___
                ORDER BY ___ ASC) AS Max_Medals
FROM Country_Medals
ORDER BY Country ASC, Year ASC;