CREATE TABLE table_name_54 (transfer_window VARCHAR2, transfer_fee VARCHAR2, moving_to VARCHAR2)

What Transfer window that has a Transfer fee of free, with a Moving to of derby county?
SELECT transfer_window FROM table_name_54 WHERE transfer_fee = "free" AND moving_to = "derby county"
SELECT "transfer_window" FROM "table_name_54" WHERE "derby county" = "moving_to" AND "free" = "transfer_fee"