2022年5月31日
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(34) 评论(0) 推荐(0)
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(71) 评论(0) 推荐(0)