relational algebra造句
例句與造句
- In relational databases , an operator in relational algebra
在關(guān)系數(shù)據(jù)庫(kù)中，關(guān)系代數(shù)用的一種運(yùn)算符。 - It is implied by the associative and commutative transformations permitted in relational algebra
它由關(guān)系代數(shù)中允許的關(guān)聯(lián)轉(zhuǎn)換和交換轉(zhuǎn)換表示。 - Leap is an rdbms ( relational database management system ) implementing the relational algebra - a core part of relational database theory
Leap是一個(gè)rdbms ，它實(shí)現(xiàn)了關(guān)系代數(shù)，關(guān)系數(shù)據(jù)庫(kù)理論的一個(gè)核心部分。 - A clause is formalized as a relational algebra expression and evaluated by employment of relational algebra operations . 3 . the proof theory based on xml is presented
提出了利用關(guān)系代數(shù)運(yùn)算實(shí)現(xiàn)xml查詢子句求值的方法，并證明了該方法的正確性。 - This course is designed to introduce graduate students to the foundations of database systems , focusing on basics such as the relational algebra and data model , query optimization , query processing , and transactions
課程描述本課程設(shè)計(jì)的目的是給研究生介紹數(shù)據(jù)庫(kù)的基礎(chǔ)知識(shí)，關(guān)注于基礎(chǔ)，如關(guān)系代數(shù)和數(shù)據(jù)模型，查詢優(yōu)化、查詢處理和事務(wù)。 - It's difficult to find relational algebra in a sentence. 用relational algebra造句挺難的
- An approach to formalize and evaluate relational algebra operations by means of xdd is presented . a query is formalized as one or more xml clauses and evaluated by employment of equivalent transformation of xdd
提出了根據(jù)關(guān)系代數(shù)表達(dá)式構(gòu)造查詢子句的方法，關(guān)系代數(shù)表達(dá)式可以用若干個(gè)xml子句描述，并通過(guò)等價(jià)變換得到查詢結(jié)果，證明了該方法的正確性。 - In addition , because there is internal relationship between the formalism of relational database , " relational algebra " , and the clausal logic used by ilp , ilp methods can directly deal with mining task involved in multiple tables of relational database
此外，由于關(guān)系數(shù)據(jù)庫(kù)的形式描述? “關(guān)系代數(shù)”與ilp的子句邏輯有著內(nèi)在的關(guān)聯(lián)性， ilp技術(shù)可被直接用于涉及關(guān)系數(shù)據(jù)庫(kù)中多個(gè)關(guān)系(表)的數(shù)據(jù)挖掘任務(wù)。 - At the same time , we propose a representative data model , i . e . gt data model , and its query language . theoretically , we deeply study the temporal relational algebra and sql - like language based on our ter model , laying a solid theoretic foundation for our accelerator rjf cavity design system
因此，論文提出了一個(gè)概念性數(shù)據(jù)模型，即時(shí)態(tài)實(shí)體一關(guān)系數(shù)據(jù)模型（ ter模型廠提出了一個(gè)表示性數(shù)扼模型，即gt數(shù)據(jù)模型及其查詢語(yǔ)言。 - In order to unify stored data - mining results in pattern warehouse , the author probes intensively into the storage methods of data - mining results ( association rules , classification rules , sequential patterns ) . it proposes the storage methods to use the relational algebra to describe . this realizes consistent storage of data - mining results in relational database
為使數(shù)據(jù)挖掘結(jié)果能統(tǒng)一存儲(chǔ)在模式庫(kù)中，作者對(duì)關(guān)聯(lián)規(guī)則、分類規(guī)則和序列模式挖掘結(jié)果的存儲(chǔ)方法進(jìn)行了深入的研究，提出了數(shù)據(jù)挖掘結(jié)果模式的存儲(chǔ)方法，并用關(guān)系代數(shù)進(jìn)行了描述，在關(guān)系數(shù)據(jù)庫(kù)中實(shí)現(xiàn)了多種數(shù)據(jù)挖掘結(jié)果模式的統(tǒng)一存儲(chǔ)。 - Topics include : relational databases , sql ( structured query language ) ; types , relations , relational algebra , integrity , view ; functional dependency theory , normalization , semantic modeling , entity - relationship modeling , conceptual database design ; concurrency control , security ; database and web connectivity , xml
主題包括:關(guān)聯(lián)式資料庫(kù)、 sql (結(jié)構(gòu)查詢語(yǔ)言) ;資料類型、關(guān)聯(lián)、關(guān)聯(lián)式代數(shù)、完整性、景觀表;功能依附理論、正規(guī)化、語(yǔ)義塑模、實(shí)體關(guān)聯(lián)塑模、概念性資料庫(kù)設(shè)計(jì);同時(shí)操作控制、安全;資料庫(kù)與網(wǎng)頁(yè)連結(jié)、 xml (可擴(kuò)展標(biāo)示語(yǔ)言) 。 - Many mature technologies on this level have been brought out , such as the relational algebra law , the improved logical query plan , the cost estimation of operation , the selective plan based on cost and order of joint , etc . although many methods have been tried out , no remarkable result or noteworthy technology has come to reality because of complexity of data decomposition and network effects
例如，從物理查詢計(jì)劃的底層磁盤輸入輸出到語(yǔ)法分析階段的語(yǔ)法分析樹、用于改進(jìn)查詢計(jì)劃的代數(shù)定律、邏輯查詢計(jì)劃的改進(jìn)，以及操作代價(jià)的估計(jì)、基于代價(jià)的計(jì)劃和連接順序的選擇等全過(guò)程，都進(jìn)行了不懈的努力。在這方面的研究已經(jīng)非常成熟。