Gender के अनुसार reigning champions

WITH Tennis_Gold AS (
  SELECT DISTINCT
    Gender, Year, Country
  FROM Summer_Medals
  WHERE
    Year >= 2000 AND
    Event = 'Javelin Throw' AND
    Medal = 'Gold')

SELECT
  Gender, Year,
  Country AS Champion,
  -- Fetch the previous year's champion by gender
  ___ OVER (___
            ORDER BY ___ ASC) AS Last_Champion
FROM Tennis_Gold
ORDER BY Gender ASC, Year ASC;