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数据库技术与应用

王珊

... 代数或逻辑方式来表示,分别称为关系代数和关系演算。关系代数是用对关系的运算来表达查询要求的方式。关系演算是用谓词来表达查询要求的方式。关系代数和关系演算在表达能力上是完全等价的,本书将在第 2.2 节 ... 关系模型的完整性约束是第 2 章关系数据库.

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Length: 300 pages

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