# relational algebra造句

## 例句與造句

1. In relational databases , an operator in relational algebra
在關系數據庫中，關系代數用的一種運算符。
2. It is implied by the associative and commutative transformations permitted in relational algebra
它由關系代數中允許的關聯轉換和交換轉換表示。
3. Leap is an rdbms ( relational database management system ) implementing the relational algebra - a core part of relational database theory
Leap是一個rdbms ，它實現了關系代數，關系數據庫理論的一個核心部分。
4. 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
提出了利用關系代數運算實現xml查詢子句求值的方法，并證明了該方法的正確性。
5. 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
課程描述本課程設計的目的是給研究生介紹數據庫的基礎知識，關注于基礎，如關系代數和數據模型，查詢優化、查詢處理和事務。
6. It's difficult to find relational algebra in a sentence. 用relational algebra造句挺難的
7. 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
提出了根據關系代數表達式構造查詢子句的方法，關系代數表達式可以用若干個xml子句描述，并通過等價變換得到查詢結果，證明了該方法的正確性。
8. 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，由于關系數據庫的形式描述? “關系代數”與ilp的子句邏輯有著內在的關聯性， ilp技術可被直接用于涉及關系數據庫中多個關系(表)的數據挖掘任務。
9. 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，論文提出了一個概念性數據模型，即時態實體一關系數據模型（ ter模型廠提出了一個表示性數扼模型，即gt數據模型及其查詢語言。
10. 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
為使數據挖掘結果能統一存儲在模式庫中，作者對關聯規則、分類規則和序列模式挖掘結果的存儲方法進行了深入的研究，提出了數據挖掘結果模式的存儲方法，并用關系代數進行了描述，在關系數據庫中實現了多種數據挖掘結果模式的統一存儲。
11. 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:關聯式資料庫、 sql (結構查詢語言) ;資料類型、關聯、關聯式代數、完整性、景觀表;功能依附理論、正規化、語義塑模、實體關聯塑模、概念性資料庫設計;同時操作控制、安全;資料庫與網頁連結、 xml (可擴展標示語言) 。
12. 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，從物理查詢計劃的底層磁盤輸入輸出到語法分析階段的語法分析樹、用于改進查詢計劃的代數定律、邏輯查詢計劃的改進，以及操作代價的估計、基于代價的計劃和連接順序的選擇等全過程，都進行了不懈的努力。在這方面的研究已經非常成熟。