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Leetfs committed Sep 13, 2024
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9 changes: 5 additions & 4 deletions docs/zh/sql/02/03.md
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![层次模型结构图](./image1.png)


-****的形式
- 有且仅有一个节点,并且没有双亲,称为根节点
- 有且仅有一个其它

### 优点

- 结构简单清晰
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- 查询不灵活
- 编写较为复杂

-****的形式
- 有且仅有一个节点,并且没有双亲,称为根节点
- 有且仅有一个其它

## 网状模型

![网状模型结构图](./image2.png)
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