... SOHOADON, TENHANG, CHITIETDATHANG.SOLUONG*GIABAN*(1- MUCGIAMGIA/100) AS 'SỐ TIỀN PHẢI TRẢ' FROM MATHANG, CHITIETDATHANG WHERE MATHANG.MAHANG=CHITIETDATHANG.MAHANG AND CHITIETDATHANG.SOHOADON=3 ... FROM CHITIETDATHANG /*SELECT DISTINCT DONDATHANG.MAKHACHHANG,CHITIETDATHANG.SOHOADON, SUM(SOLUONG*GIABAN) AS 'THANHTIEN' FROM CHITIETDATHANG, DONDATHANG GROUP BY MAKHACHHANG, CHITIETDATHANG.SOHOADON*/ ... DONDATHANG.MAKHACHHANG, CHITIETDATHANG.SOHOADON, SUM(SOLUONG*GIABAN) AS 'THANHTIEN' FROM CHITIETDATHANG, DONDATHANG WHERE DONDATHANG.SOHOADON=CHITIETDATHANG.SOHOADON GROUP BY MAKHACHHANG,CHITIETDATHANG.SOHOADON...