2) nested relation
嵌套关系
1.
In this paper, a relational database based on nested relation is proposed it supports text storage and text operator.
本文提出的一个嵌套关系模型支持文本存储和文本检索操作，其中特征文件索引为文本检索提供了技术支持。
2.
This paper discusses some issues in nested relational databases,which mainly include the e-valuation on two normal forms PNF and NNF,missing information and the conversion form flat rela-tional schema to nested relational schema.
本文讨论了嵌套关系数据库中的一些问题，主要包括对两种范式ＰＮＦ和ＮＮＦ的评价、空值和从平面关系到嵌套关系的转换。
3.
Based on the concept of relation and sub-relation, this paper investigates the inherent meaning of traditional set operations for the nested relational data model.
从关系和子关系观点出发，探讨嵌套关系数据模型中传统集合运算的语义问题。
3) nested relations
关系嵌套
1.
Based on the inefficiencies of temporal data processing, this paper presents temporal data model base on N1NF that allows nested relations, new temporal operations are posted according to the characteristics of the model, which are described with relational algebra.
基于对时态数据的处理效率问题,提出一种允许关系嵌套的N1NF的时态数据模型,根据模型的特性建立了新的时态操作,并通过关系代数描述了这些时态操作,最后说明本模型的有效性。
2.
Based on the inefficiencies of temporal data processing,this paper presents temporal data model base on N1NF that allows nested relations,new temporal operations are posted according to the characteristics of the model,which are described with relational algebra.
基于对时态数据的处理效率问题,本文提出了一种允许关系嵌套的 N1NF 的时态数据模型, 根据模型的特性建立了新的时态操作,并通过关系代数描述了这些时态操作,最后说明了本模型的有效性。
6) nested relational algebra
嵌套关系代数
补充资料：嵌套PCR
分子式：
CAS号：
性质：后一次PCR的引物互补于前一次PCR所扩增序列的内侧。
CAS号：
性质：后一次PCR的引物互补于前一次PCR所扩增序列的内侧。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条