Table: bayern_munich_players_2008
Columns: nat
name
type
transfer_window
transfer_fee

Question: Willy Sagnol with a type as career end had what has the transfer fee?
SQL: SELECT "transfer_fee" FROM bayern_munich_players_2008 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 bayern_munich_players_2008 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 bayern_munich_players_2008 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 bayern_munich_players_2008 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 bayern_munich_players_2008 WHERE "transfer_window" = 'summer' AND "nat" = 'ger' AND "transfer_fee" = 'n/a'