87. SQL語法UPDATE之正確寫法為何？ (A)UPDATE bookname FROM Books WHERE id = 2 SET bookname ='哈利波特' (B)UPDATE FROM Books WHERE id = 2 SET bookname = '哈利波特' (C)UPDATE Books WHERE id = 2 SET bookname = '哈利波特' (D)UPDATE Books SET bookname = '哈利波特' WHERE id = 2。