1) relational calculus
关系演算
1.
Analysis and Research of Functional Mechanism of Relational Calculus;
关系演算运行机制的分析与研究
2.
Based on this model, this paper constructs two different kinds of fuzzy database query languages: the fuzzy relational algebra and fuzzy relational calculus.
在此基础上，构造了两类不同的模糊数据库查询语言：模糊关系代数和模糊关系演算。
2) Domain Relational Calculus
域关系演算
3) medium relational calculus
中介关系演算
1.
Based on the medium predicate calculus MF, the medium relational calculus can extend the expressive power of relational calculus by introducing the degree word of truth value, opposite negative word ヲ and fuzzy negative word ~.
给出了中介关系数据模型，在此基础上构造了两类不同的中介关系数据库查询语言：中介关系演算和中介关系代数。
4) calculus for nested relations
嵌套关系演算
5) tuple (relation) calculus
元组 (关系) 演算
6) relationship mapping inversion
关系运算反演原则
补充资料：经济关系(见生产关系)
经济关系(见生产关系)
economical relation
1 ingji gU口nxj经济关系(eeonomieal relation)系。见生产关
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参考词条