Table: player_transfers_0809_3
Columns: exit_date
pos
player
to_club
transfer_fee

Question: What club received a DF player for free?
SQL: SELECT "to_club" FROM player_transfers_0809_3 WHERE "transfer_fee" = 'free' AND "pos" = 'df'

Question: Which player was transferred to Reggina?
SQL: SELECT "player" FROM player_transfers_0809_3 WHERE "to_club" = 'reggina'

Question: What is the exit date of the player transferred to Reggina for free?
SQL: SELECT "exit_date" FROM player_transfers_0809_3 WHERE "transfer_fee" = 'free' AND "to_club" = 'reggina'