理学 数据库系统 释 relational algebra 关系代数 一种抽象的关系数据语言，它通过对关系的运算来表达查询。
algebra of relations 关系代数 relation algebra 关系代数 relational algebra 关系代数 relationship algebra 关系代数
数据库 数据库理论 释文 relational algebra 关系代数
- Cars
- car safety dog
- car sharing
- Carslaw
- Carsologica Sinica
- Carson
- Carson City
- Carson McCullers
- Carson transform
- car stopper
- Carswell crater
- cars winding on slope
- CART
- Cartagena
- Cartagena International Film Festival
- Cartagena Manifesto
- Cartagena protocol on biological safety
- Cartagena Protocol on Biosafety
- cartagena protocol on biosafety
- Cartago
- Cartan
- Cartan algebra
- Cartan connection
- Cartan criterion
- Cartan criterion of solvability