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ER model

저작시기 2010.11 |등록일 2010.11.14 파워포인트파일MS 파워포인트 (ppt) | 27페이지 | 가격 1,500원

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ER Model

목차

E-R Model (Entity Relationship)
Attributes
Identifiers (Keys)
Characteristics of Identifiers
Degree of Relationships
Cardinality of Relationships
Strong vs. Weak Entities, and Identifying Relationships
Associative Entities

본문내용

E-R Model (Entity Relationship)

Entity instance - person, place, object, event, concept (often corresponds to a row in a table)
Entity Type – collection of entities (often corresponds to a table)
Attribute - property or characteristic of an entity type (often corresponds to a field in a table)
Relationship type – category of relationship…link between entity types

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