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。
数据库 数据库理论 释文 relational calculus 关系演算
- Roger Kasperson
- Roger Nimier
- Rogernomics
- Roger Planchon
- Rogers
- Rogers Centre
- Roger Schank
- Rogers Communications Inc
- Rogers'emotion education
- Roger Sessions
- Rogers L-function
- Rogers mod 14 identity
- Rogers Plan
- Rogers-Ramanujan continued fraction
- Rogers Ramanujan continued fractions
- Rogers-Ramanujan continued fractions
- Rogers Ramanujan identities
- Rogers-Ramanujan identities
- Rogers-Ramanujan identity
- Rogers-Selberg identity
- Roger Vailland
- Roger Ware Brockett
- Roger William Brown
- Roger Williams
- Roger Wolcott Sperry