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
- sideband
- side beam mirror
- side-blown converter steelmaking
- side bottom dump car
- side bound ligand
- side-bound ligand
- side-burning
- side-by-side offloading
- side chain
- side chain liquid crystalline polymer
- side-chain liquid crystalline polymer
- side chain modification
- side channel analysis
- side-channel analysis
- side channel attack
- side-channel attack
- side channel cryptanalysis
- side-channel cryptanalysis
- side channel spillway
- side condition
- side cone
- side-discharging car
- side-ditch and slope-protection construction machinery
- side-dressing
- side drift