理学 数据库系统 释 relational calculus 关系演算 一种抽象的关系数据语言，它通过数理逻辑中的谓词演算表达查询的要求。
calculus of relations 关系演算
数据库 数据库理论 释文 relational calculus 关系演算
- parallel projection
- parallel projection method
- parallel proportional profile
- parallel prose
- Parallel Proses of Six Dynasties
- parallel quadrilateral
- parallel random access machine
- parallel random access machine, PRAM
- parallel reaction
- parallel reactions
- parallel real-time processing
- parallel redundancy
- parallel replica molecular dynamics
- parallel resonance
- parallel resonance circuit
- parallel retrieval
- parallel ruler
- parallel run
- parallel search memory
- parallel sections
- parallel selection algorithm
- parallel series hybrid electric vehicle
- parallel-series network
- parallel set
- parallel shooting method