Who is the youngest player to have won the Purple Cap?
Who refers to Player_Name; youngest player to have won the Purple Cap refers to min(subtract(Season_Year, DOB))
SELECT T1.Player_Name FROM Player AS T1 INNER JOIN Season AS T2 ON T1.Player_Id = T2.Purple_Cap ORDER BY T2.Season_Year - SUBSTR(T1.DOB, 1, 4) LIMIT 1