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Jelly

Hello World 操作系统笔记 单调栈
数据库复习
2021-04-07 · via Jelly
关系模型 关系数据库使用一个或多个表来存储数据。 数学上把一系列域上的笛卡尔积的子集称为关系。 软件系统无法保证数据的真实正确性,但可以保证数据符合可明确定义的约束。这种约束通常称为完整性约束。它是数据安全性的一部分。…