Welcome to ecourse.org: the Information Infrastructure for Education in the information age! This system allows instructors from any school or college (including home schools and training programs) to teach either onsite or online courses . It allows students to manage all their ongoing school works and past academic records at one location.
Our mission is to redefine the model of learning and re-engineer its process by providing innovative administrative and instructional technologies. Click here for our beliefs.
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Could another species someday replace us as Earth's dominant intelligent life and, if so, which species?
(324 Week 4 Outline) (by Liping Liu) Review Questions:
How to handle multi-valued attributes
How to handle data on relationships
ERD ==> Relational Model Rules (L1:m, 1:1, m:m)
Course and Sections (why splits), Course and Prerequisites (Two entities or one?), Grade (where to store it), minimum grade required for prerequisites
Lecture 1: Advanced Data Modeling (Continue)
4) What about entities that are different but similar? (Chapter 3 of LIU)
Super and sub type entities: How to handle different types of entities that have many attributes in common, e... more >>
(324 Week 2 Outline) (by Liping Liu) Review:
Homework Question to Review
Database Concepts:
A record is an array of observations on one entity: Entity (ERD) <—> Record (RM)
Attributes are properties or dimensions of entities (business objects) to be observed, but attributes must be relevant, singled valued, and non-foreign... more >>
This system is designed and developed by Professor Liping Liu with financial support from Southern Illinois University at Carbondale. It evolved from a prior version called CourseWeb (for courses prior to Year 2000) and UXTEND.COM and www.e-course.org.
