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Leetfs committed Sep 13, 2024
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## 数据结构

数据操作是对系统静态特性的描述

## 数据操作

数据库主要有 `查询和更新` 两大类操作

数据操作是对系统动态特性的描述

## 数据完整性约束

数据的约束条件是一组 `完整性规则` 的集合

### 完整性规则

- 保障了数据**正确、有效、相容**

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