【数据库系统】形式化查询语言の关系代数

星拱北辰发布时间：2020-09-26 19:27:53 ，浏览量：0

文章目录

基本的关系代数运算
- σ \sigma σ
- Π \Pi

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【数据库系统】形式化查询语言の关系代数

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