A.E-R圖 B.關(guān)系模式 C.數(shù)據(jù)字典和數(shù)據(jù)流圖 D.任務(wù)書和設(shè)計方案
A.數(shù)據(jù)轉(zhuǎn)換 B.數(shù)據(jù)抽取 C.數(shù)據(jù)清洗 D.數(shù)據(jù)裝載
A.1NF B.2NF C.3NF D.BCNF