A.窗體頁(yè)眉B.主體C.窗體頁(yè)腳D.頁(yè)面頁(yè)腳
A.PRIMARY KEYB.PRIMARY KEY ..REFERENCES...C.FREIGN KEYD.FREIGN KEY ...REFERENCES...
A.恢復(fù)刪除的數(shù)據(jù)B.提高系統(tǒng)性能C.實(shí)現(xiàn)數(shù)據(jù)完整性D.實(shí)現(xiàn)故障恢復(fù)