er model isa
sets such as ISA, UNION, INTERSECTION etc. The structure of a database can be represented by using an entity-relationship diagram. Many extensions have ... ,Entities. Attributes. Relationships. Weak Entity Types. ISA relationships. The Entity Relationship Model. ▷ An example of a conceptual (high-level) data model.
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 er model isa 相關參考資料
Entity Relationship Diagram. How does the IS A relationship ...
Assuming the relationship is mandatory (as you said, a person has to be a student or a teacher) and disjoint (a person is either a student or a ... https://stackoverflow.com Entity-Relationship Approach - ER '94. Business Modelling and ...
sets such as ISA, UNION, INTERSECTION etc. The structure of a database can be represented by using an entity-relationship diagram. Many extensions have ... https://books.google.com.tw Entity-Relationship Model
Entities. Attributes. Relationships. Weak Entity Types. ISA relationships. The Entity Relationship Model. ▷ An example of a conceptual (high-level) data model. http://www.dcs.bbk.ac.uk ER模型- 維基百科，自由的百科全書 - Wikipedia
ER模型，全稱為實體聯絡模型、實體關係模型或實體聯絡模式圖（ERD）（英語：Entity-relationship model）由美籍 ... 要指示這種關聯，繪製其中帶有"ISA" 的三角形。 https://zh.wikipedia.org ER模型詳解-陳氏模型- 壹讀
1976年Peter Chen首次提出了Entity Relationship Modeling（實體關係 ... 的實體，使用ISA關聯關係（關聯關係名稱為ISA，也有採用類似UML繼承的 ... https://read01.com ISA relationship ER diagram - Stack Overflow
A supertype can have any number of subtypes. However, it's only useful to define subtypes if they'll have their own attributes or relationships. https://stackoverflow.com The Entity-Relationship Model
isA. The Entity-Relationship Model -- 8. CSC343 -- Introduction to Databases. ▫ Used when we have to model a relationship involving (entity sets and) and. http://www.cs.toronto.edu Yi: 利用『實體-關係模型(E-R Model)』規劃資料庫
實體-關係模型(Entity-Relationship Model): 是一套資料庫的設計工具，運用了真實世界中 ... 特殊化(Specialization): 以ISA(is a)來表示特殊化的關係 ... http://9715036.blogspot.com 資料庫理論 - 國家考試，資訊處理加油站
例如：關聯式資料庫管理系統的邏輯資料模式(logical data model) ... 圖一是個實體關係圖(Entity-Relationship Diagram)， 對所用符號的約略說明： 其中每一 .... 階層關係是由ISA 關係(簡寫ISA)表示， ISA 支援屬性繼承及關係參與， 屬性繼承子類型會 ... http://fhopecc.freeoda.com |