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Leetfs committed Sep 13, 2024
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### 候选码

唯一标识一个实体的*最小属性*集合
唯一标识一个实体的**最小属性**集合

### 主码

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- 一对一 `1:1` (至多有一个实体与之联系)
- 一对多 `1:n`
- 多对多 `m:n`

### 三个实体集

例:老板-企业-员工
- 多对多 `m:n`

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