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
- Thang stong rgyalpo
- Thang Tong Gyalpo
- Thank you for the Little Cat
- thanosome
- Than Shwe
- Thao language
- Thar Desert
- Tharsis Bulge
- Tharsis bulge
- Tharwat Abaza
- Thascius Caecilius Cyprien
- That Autumn at Xuantingkou
- Thatbyinnyu Temple
- Thatcher's miracle
- That's Persistence
- That Tender Age
- thaw collapse
- thawing
- thawing rate
- thawing water
- THC
- THD
- The 100-Years-Old Lady to be Commander
- the 10-character regulation for salt marketing
- the 10-division army system