Paraconsistent database , which based on 4 - valued paraconsistent logic and relational data model , can effective manipulate two kinds of uncertain information 但以次協(xié)調(diào)邏輯與關(guān)系數(shù)據(jù)模型相結(jié)合而產(chǎn)生的次協(xié)調(diào)數(shù)據(jù)庫能夠有效地處理這兩類不確定信息。
Based on the schema of the system of information integration , the dissertation presents a common data model ( jidm ) which is a relational data model based on java 在分析了信息集成系統(tǒng)的模式結(jié)構(gòu)的基礎(chǔ)上,本文提出了一種基于java的關(guān)系數(shù)據(jù)模型( jidm )作為集成系統(tǒng)的公共數(shù)據(jù)模型。
In the database designing , this paper researches the design method , which combines expended relational data model and object ? elational data model , and realized the graph and image database 在數(shù)據(jù)庫設(shè)計(jì)中研究了使用擴(kuò)展關(guān)系數(shù)據(jù)模型和對(duì)象關(guān)系數(shù)據(jù)模型相結(jié)合的設(shè)計(jì)方法并成功實(shí)現(xiàn)圖形圖像數(shù)據(jù)庫。
Based on the reference feature of object - relational data model and the query language , the join algorithm sort - loops , probe - loops and segment - join are proposed , their performance are analyzed and compared 針對(duì)對(duì)象關(guān)系數(shù)據(jù)模型和查詢語言所支持的引用特性,設(shè)計(jì)了基于引用的連接算法sort - loops 、 probe - loops以及segment - join 。
As virtual database uses relational data model , the paper makes a special effort to discuss query rewriting technology - rewriting queries using views and its conjunctive query , containment mapping under this model 基于虛擬數(shù)據(jù)庫所采用的關(guān)系數(shù)據(jù)模型,著重探討了該模型下的查詢重寫技術(shù)? ?利用視圖重寫查詢以及基于其上的合取查詢、包含映射等問題。
relational data model meaning:[Computer] < database > (Or "relational model") A data model introduced by E.F. Codd in 1970, particularly well suited for business data management. In this model, data are organised in ...relational data model перевод:реляционная модель данных