政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/102988
English  |  正體中文  |  简体中文  |  Post-Print筆數 : 27 |  Items with full text/Total items : 113648/144635 (79%)
Visitors : 51688309      Online Users : 522
RC Version 6.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
    •  Adv. Search
    Home ‧ Login ‧ Upload ‧ Help ‧ About ‧ Administer Goto mobile version
    政大典藏 > Journal of NCCU > Issue 75 > Journal Articles >  Item 140.119/102988


    Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/102988


    Title: Database Abstractions = Data Abstractions + Semantic Integrity Constraints Abstractions
    Authors: 楊亨利
    Yang, Heng-Li
    Contributors: 資管系
    Date: 1997-10
    Issue Date: 2016-10-18 16:36:31 (UTC+8)
    Abstract: 傳統資料庫設計技術集中在結構的設計與效率的考慮。然而，一個已是第四甚或第五正規化的關連式資料庫仍代表很少的資料語意。一個資料庫的概廓應包含「結構」的部份及「語意完整性限制」部份。同樣地，「資料庫抽象化」也應包含「資料抽象化」及「語意完整性限制抽象化」。「資料抽象化」用以將真實世界的「結構」部分概念化、抽象化。而本文提出新的抽象化觀念以對「語意完整性限制」造模。這將減少必須明顯及完全表示出來的語意完整性限制，並有助於語意完整性限制的組織與管理。
    Traditional datadase design techniques focus on structure and efficiency.However, a relational database in fourth or fifth normal form may still represent little of the data semantics. A database schema should consist of both structures and semantic integrity constraints (SICs). Similarly, database abstractions should also include data abstractions and semantic integrity constraints abstractions. Data abstractions have been applied to conceptualize the structure part of the real world. This paper proposes new abstractions to model the semantic integrity constraints. It would reduce the number of SICs, which must be represented explicitly and fully, and help the SIC organization and management.
    Relation: 國立政治大學學報,75 part2,189-212
    Data Type: article
    Appears in Collections:[Issue 75] Journal Articles

    Files in This Item:

    File Description SizeFormat
    75-2-189.pdf1913KbAdobe PDF2555View/Open


    All items in 政大典藏 are protected by copyright, with all rights reserved.


    社群 sharing

    著作權政策宣告 Copyright Announcement
    1.本網站之數位內容為國立政治大學所收錄之機構典藏，無償提供學術研究與公眾教育等公益性使用，惟仍請適度，合理使用本網站之內容，以尊重著作權人之權益。商業上之利用，則請先取得著作權人之授權。
    The digital content of this website is part of National Chengchi University Institutional Repository. It provides free access to academic research and public education for non-commercial use. Please utilize it in a proper and reasonable manner and respect the rights of copyright owners. For commercial use, please obtain authorization from the copyright owner in advance.

    2.本網站之製作，已盡力防止侵害著作權人之權益，如仍發現本網站之數位內容有侵害著作權人權益情事者，請權利人通知本網站維護人員(nccur@nccu.edu.tw)，維護人員將立即採取移除該數位著作等補救措施。
    NCCU Institutional Repository is made to protect the interests of copyright owners. If you believe that any material on the website infringes copyright, please contact our staff(nccur@nccu.edu.tw). We will remove the work from the repository and investigate your claim.
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback