Studying Introduction to database and database system

[Carebie]

Hi all,


I am currently studying introduction to database and database system. Our topic is to create a Logical Schema for the UML Class Diagram by using ODLs and to Create the classes together with its attributes, relationships and operations using the ODLs.
Does anyone know the meaning of Logical Schema? Does anyone know the meaning of these keywords: extent, generalization, relationship sets, abstract classes and the enum attribute type? Please help......Thanks

[ssanfu]

Welcome to the forum.

If you Google the terms, I'm sure you will find hundreds of hits. Since this is for a class, you really need to do the work. I have.......

Good luck with your class.

[orange]

As Steve says--- Google Google

Check youtube https://www.youtube.com/watch?v=gaAYttaEbx0

and https://www.youtube.com/watch?v=UAwGAfsv8zo

There are several..... here's one by Jennifer Widom***** she's good...very good.