Solve the following sql problem:
What is the difference between the number of matches where SC Ganguly played as a Captain and those matches where he played other roles?

Schema:
SCHEMA:
- Table: Batting_Style
  - Column: Batting_Id
    - Samples: [1, 2]
  - Column: Batting_hand
    - Samples: [Left-hand bat, Right-hand bat]
- Table: Bowling_Style
  - Column: Bowling_Id
    - Samples: [1, 2, 3, 4, 5]
  - Column: Bowling_skill
    - Samples: [Right-arm medium, Right-arm offbreak, Right-arm fast-medium, Legbreak googly, Right-arm medium-fast]
- Table: City
  - Column: City_Id
    - Samples: [1, 2, 3, 4, 5]
  - Column: City_Name
    - Samples: [Bangalore, Chandigarh, Delhi, Mumbai, Kolkata]
  - Column: Country_id
    - Samples: [1, 1, 1, 1, 1]
- Table: Country
  - Column: Country_Id
    - Samples: [1, 2, 3, 4, 5]
  - Column: Country_Name
    - Samples: [India, South Africa, U.A.E, New Zealand, Australia]
- Table: Extra_Type
  - Column: Extra_Id
    - Samples: [1, 2, 3, 4, 5]
  - Column: Extra_Name
    - Samples: [legbyes, wides, byes, noballs, penalty]
- Table: Extra_Runs
  - Column: Match_Id
    - Samples: [335987, 335987, 335987, 335987, 335987]
  - Column: Over_Id
    - Samples: [1, 1, 1, 1, 2]
  - Column: Ball_Id
    - Samples: [1, 2, 3, 7, 3]
  - Column: Extra_Type_Id
    - Samples: [1, 2, 2, 1, 1]
  - Column: Extra_Runs
    - Samples: [1, 1, 1, 1, 4]
  - Column: Innings_No
    - Samples: [1, 2, 1, 1, 2]
- Table: Out_Type
  - Column: Out_Id
    - Samples: [1, 2, 3, 4, 5]
  - Column: Out_Name
    - Samples: [caught, bowled, run out, lbw, retired hurt]
- Table: Outcome
  - Column: Outcome_Id
    - Samples: [1, 2, 3]
  - Column: Outcome_Type
    - Samples: [Result, No Result, Superover]
- Table: Player
  - Column: Player_Id
    - Samples: [1, 2, 3, 4, 5]
  - Column: Player_Name
    - Samples: [SC Ganguly, BB McCullum, RT Ponting, DJ Hussey, Mohammad Hafeez]
  - Column: DOB
    - Samples: [1972-07-08, 1981-09-27, 1974-12-19, 1977-07-15, 1980-10-17]
  - Column: Batting_hand
    - Samples: [1, 2, 2, 2, 2]
  - Column: Bowling_skill
    - Samples: [1, 1, 1, 2, 2]
  - Column: Country_Name
    - Samples: [1, 4, 5, 5, 6]
- Table: Rolee
  - Column: Role_Id
    - Samples: [1, 2, 3, 4]
  - Column: Role_Desc
    - Samples: [Captain, Keeper, Player, CaptainKeeper]
- Table: Season
  - Column: Season_Id
    - Samples: [1, 2, 3, 4, 5]
  - Column: Man_of_the_Series
    - Samples: [32, 53, 133, 162, 315]
  - Column: Orange_Cap
    - Samples: [100, 18, 133, 162, 162]
  - Column: Purple_Cap
    - Samples: [102, 61, 131, 194, 190]
  - Column: Season_Year
    - Samples: [2008, 2009, 2010, 2011, 2012]
- Table: Team
  - Column: Team_Id
    - Samples: [1, 2, 3, 4, 5]
  - Column: Team_Name
    - Samples: [Kolkata Knight Riders, Royal Challengers Bangalore, Chennai Super Kings, Kings XI Punjab, Rajasthan Royals]
- Table: Toss_Decision
  - Column: Toss_Id
    - Samples: [1, 2]
  - Column: Toss_Name
    - Samples: [field, bat]
- Table: Umpire
  - Column: Umpire_Id
    - Samples: [1, 2, 3, 4, 5]
  - Column: Umpire_Name
    - Samples: [Asad Rauf, MR Benson, Aleem Dar, SJ Davis, BF Bowden]
  - Column: Umpire_Country
    - Samples: [6, 10, 6, 10, 4]
- Table: Venue
  - Column: Venue_Id
    - Samples: [1, 2, 3, 4, 5]
  - Column: Venue_Name
    - Samples: [M Chinnaswamy Stadium, Punjab Cricket Association Stadium, Feroz Shah Kotla, Wankhede Stadium, Eden Gardens]
  - Column: City_Id
    - Samples: [1, 2, 3, 4, 5]
- Table: Win_By
  - Column: Win_Id
    - Samples: [1, 2, 3, 4]
  - Column: Win_Type
    - Samples: [runs, wickets, NO Result, Tie]
- Table: Match
  - Column: Match_Id
    - Samples: [335987, 335988, 335989, 335990, 335991]
  - Column: Team_1
    - Samples: [2, 4, 6, 7, 1]
  - Column: Team_2
    - Samples: [1, 3, 5, 2, 8]
  - Column: Match_Date
    - Samples: [2008-04-18, 2008-04-19, 2008-04-19, 2008-04-20, 2008-04-20]
  - Column: Season_Id
    - Samples: [1, 1, 1, 1, 1]
  - Column: Venue_Id
    - Samples: [1, 2, 3, 4, 5]
  - Column: Toss_Winner
    - Samples: [2, 3, 5, 7, 8]
  - Column: Toss_Decide
    - Samples: [1, 2, 2, 2, 2]
  - Column: Win_Type
    - Samples: [1, 1, 2, 2, 2]
  - Column: Win_Margin
    - Samples: [140, 33, 9, 5, 5]
  - Column: Outcome_type
    - Samples: [1, 1, 1, 1, 1]
  - Column: Match_Winner
    - Samples: [1, 3, 6, 2, 1]
  - Column: Man_of_the_Match
    - Samples: [2, 19, 90, 11, 4]
- Table: Ball_by_Ball
  - Column: Match_Id
    - Samples: [335987, 335987, 335987, 335987, 335987]
  - Column: Over_Id
    - Samples: [1, 1, 1, 1, 1]
  - Column: Ball_Id
    - Samples: [1, 1, 2, 2, 3]
  - Column: Innings_No
    - Samples: [1, 2, 1, 2, 1]
  - Column: Team_Batting
    - Samples: [1, 2, 1, 2, 1]
  - Column: Team_Bowling
    - Samples: [2, 1, 2, 1, 2]
  - Column: Striker_Batting_Position
    - Samples: [1, 1, 2, 2, 2]
  - Column: Striker
    - Samples: [1, 6, 2, 7, 2]
  - Column: Non_Striker
    - Samples: [2, 7, 1, 6, 1]
  - Column: Bowler
    - Samples: [14, 106, 14, 106, 14]
- Table: Batsman_Scored
  - Column: Match_Id
    - Samples: [335987, 335987, 335987, 335987, 335987]
  - Column: Over_Id
    - Samples: [1, 1, 1, 1, 1]
  - Column: Ball_Id
    - Samples: [1, 1, 2, 3, 4]
  - Column: Runs_Scored
    - Samples: [0, 1, 0, 0, 0]
  - Column: Innings_No
    - Samples: [1, 2, 1, 2, 1]
- Table: Player_Match
  - Column: Match_Id
    - Samples: [335987, 335987, 335987, 335987, 335987]
  - Column: Player_Id
    - Samples: [1, 2, 3, 4, 5]
  - Column: Role_Id
    - Samples: [1, 3, 3, 3, 3]
  - Column: Team_Id
    - Samples: [1, 1, 1, 1, 1]
- Table: Wicket_Taken
  - Column: Match_Id
    - Samples: [335987, 335987, 335987, 335987, 335987]
  - Column: Over_Id
    - Samples: [2, 3, 5, 6, 6]
  - Column: Ball_Id
    - Samples: [1, 2, 5, 2, 2]
  - Column: Player_Out
    - Samples: [6, 8, 9, 1, 7]
  - Column: Kind_Out
    - Samples: [2, 2, 1, 1, 1]
  - Column: Fielders
    - Samples: [None, None, 83, 9, 3]
  - Column: Innings_No
    - Samples: [2, 2, 2, 1, 2]

SELECT SUM(CASE WHEN T3.Role_Id = 1 THEN 1 ELSE 0 END) - SUM(CASE WHEN T3.Role_Id > 1 THEN 1 ELSE 0 END) FROM Player_Match AS T1 INNER JOIN Player AS T2 ON T1.Player_Id = T2.Player_Id INNER JOIN Rolee AS T3 ON T1.Role_Id = T3.Role_Id WHERE T2.Player_Name = 'SC Ganguly'