本节书摘来华章计算机《数据库技术原理与应用教程》一书中的第3章，第3.5.3节，徐洁磐操凤萍编著更多章节内容可以访问云栖社区“华章计算机”公众号查看。 3.5.3关系模型的数据结构、操纵和约束关系是一种数学理论，运用这种理论所得到的逻辑模型称关系模型，关系模型由关系数据结构、关系操纵及关系约束三部分组成。 1 关系数据结构 (1)表结构关系模型统一采用二维表结构。二维表由表框架（fr...

文章 2017-05-02 来自：开发者社区

《数据库原理与应用（第3版）》——3.4　关系模型的完整性约束

本节书摘来自华章出版社《数据库原理与应用（第3版）》一书中的第3章，第3.4节，作者：何玉洁，更多章节内容可以访问云栖社区“华章计算机”公众号查看。 3.4　关系模型的完整性约束数据完整性是指数据库中存储的数据是有意义的或正确的。关系模型中的数据完整性规则是对关系的某种约束条件。它的数据完整性约束主要包括三大类：实体完整性、参照完整性和用户定义的完整性。 3.4.1　实体完整性实体完整性是....

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数据库审计

满足等保2.0二级和三级 “安全审计”合规要求的同时，智能解析数据库通信流量，细粒度审计数据库访问行为，通过对数据库全量行为的审计溯源、危险攻击的实时告警、风险语句的智能预警，提供数据库资产最安全的监控保障。

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