A.層次數(shù)據(jù)庫(kù) B.網(wǎng)絡(luò)數(shù)據(jù)庫(kù) C.關(guān)系數(shù)據(jù)庫(kù) D.非數(shù)據(jù)庫(kù)
A.關(guān)系規(guī)范化、數(shù)據(jù)操縱、數(shù)據(jù)控制 B.數(shù)據(jù)定義、數(shù)據(jù)操縱、數(shù)據(jù)控制 C.數(shù)據(jù)定義、關(guān)系規(guī)范化、數(shù)據(jù)控制 D.數(shù)據(jù)定義、關(guān)系規(guī)范化、數(shù)據(jù)操縱
A.SELECT B.INSERT C.UPDATE D.DELETE