2018年3月7日
CS3402 Relational Design
摘要： Relational Design Motivation Student(StudentID, StudentName, CourseID, CourseName, Grade) Design “anomalies” Redundancy: StudentID => StudentName (cap 阅读全文
posted @ 2018-03-07 21:04 Charonnnnn 阅读(259) 评论(0) 推荐(0) 编辑
CS3402 ER
摘要： ER Explain the difference between an entity and a relationship ● An entity is an object or concept about which you want to store information. ● Relati 阅读全文
posted @ 2018-03-07 19:13 Charonnnnn 阅读(323) 评论(0) 推荐(0) 编辑