A.
UPDATE stud_info SET address = ‘衡阳市珠晖区狮山路100号’,SET postcode = ‘421002’ WHERE stud_id = 21039
B.
UPDATE stud_info SET address = ‘衡阳市珠晖区狮山路100号’; postcode = ‘421002’ WHERE stud_id = 21039
C.
UPDATE stud_info SET address = “衡阳市珠晖区狮山路100号”, postcode = “421002” WHERE stud_id = 21039
D.
UPDATE stud_info SET address = ‘衡阳市珠晖区狮山路100号’, postcode = ‘421002’ WHERE stud_id = 21039