（簡答題）簡述關(guān)系模型完整性約束條件的三種類型。
（名詞解釋）數(shù)據(jù)耦合
?（名詞解釋）概念數(shù)據(jù)模型
?（名詞解釋）系統(tǒng)設(shè)計說明書
?（簡答題）簡述結(jié)構(gòu)化設(shè)計的基本思想。
簡述系統(tǒng)安全管理的措施。
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關(guān)系模型與關(guān)系數(shù)據(jù)庫
本題考查關(guān)系模型完整性約束條件。
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