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Relational Calculus

关系演算 包含 关系演算和 元组 关系演算,是 关系型数据库 的一部分,提供了 query language#声明式(Non-Procedural/Declarative) 查询数据库的方式。

关系演算查询优化 的基础。





The relational calculus consists of two calculi, the tuple relational calculus and the domain relational calculus, that are part of the relational model for databases and provide a declarative way to specify database queries. The raison d'être of the relational calculus is the formalization of query optimization, which is finding more efficient manners to execute the same query.[1]

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