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Leetfs committed Sep 13, 2024
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- 唯一确定一个元组,且属性组不含多余的属性,为 `候选码`
- 属性的取值范围称为 ``
- 行和列的交叉为 `分量`
- 关系的型称为 `关系模式` ,关系模式是对关系的描述
- 实体和实体之间的联系用 `关系` 来表示

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