Question: Among all the matches SC Ganguly has played in, what is the highest winning margin?
SQL: SELECT MAX(T3.Win_Margin) FROM Player AS T1 INNER JOIN Player_Match AS T2 ON T1.Player_Id = T2.Player_Id INNER JOIN Match AS T3 ON T2.Match_Id = T3.Match_Id WHERE T1.Player_Name = 'SC Ganguly'