Question: Willy Sagnol with a type as Career end had what has the transfer fee?
SQL: SELECT "Transfer fee" FROM "2-18472494-4" WHERE "Type" = 'Career end' AND "Name" = 'Willy Sagnol';

Question: Marcell Jansen with a Transfer window of Summer, and of Transfer as type is from what nation?
SQL: SELECT "Nat." FROM "2-18472494-4" WHERE "Transfer window" = 'Summer' AND "Type" = 'Transfer' AND "Name" = 'Marcell Jansen';

Question: Marcell Jansen of the nation GER has what for the type?
SQL: SELECT "Type" FROM "2-18472494-4" WHERE "Nat." = 'GER' AND "Name" = 'Marcell Jansen';

Question: What player had a transfer window of Winter, and Free as the transfer fee?
SQL: SELECT "Name" FROM "2-18472494-4" WHERE "Transfer window" = 'Winter' AND "Transfer fee" = 'Free';

Question: Which player from GER has a transfer window of Summer, and a transfer fee of n/a?
SQL: SELECT "Name" FROM "2-18472494-4" WHERE "Transfer window" = 'Summer' AND "Nat." = 'GER' AND "Transfer fee" = 'n/a';