05 2022 档案

Lecture 03 Intro to Relational Model
摘要：Attribute Attribute values are (normally) required to be atomic; that is, indivisible The special value null is a member of every domain. Indicated th 阅读全文
posted @ 2022-05-31 23:22 M1stF0rest 阅读(28) 评论(0) 推荐(0) 编辑
Lecture 02 Entity-Relation Model and Relation Schemas
摘要：Mapping the entity relation model to the schema: Step 1. Mapping of Regular Entity Types• For each regular entity type create a relation that includes 阅读全文
posted @ 2022-05-31 20:55 M1stF0rest 阅读(48) 评论(0) 推荐(0) 编辑
Lecture 01 Relation model
摘要：Relational Model: A relation is unordered set that contain the relationship of attributes that represent entities. A relational database consists of a 阅读全文
posted @ 2022-05-24 18:59 M1stF0rest 阅读(71) 评论(0) 推荐(0) 编辑

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