CREATE TABLE table_204_539 (id DECIMAL, "date" TEXT, "name" TEXT, "moving from" TEXT, "moving to" TEXT, "fee" TEXT)

who had the most or highest transfer fee ?
SELECT "name" FROM table_204_539 ORDER BY "fee" DESC LIMIT 1
SELECT "name" FROM "table_204_539" ORDER BY "fee" DESC NULLS LAST LIMIT 1