eer-model

In the EER model there are subclasses entities. I was wondering what's the way to implement that in a real SQL Table or if there is any guide that might help me out to understand how to implement entities subclasses into tables that would help. Thanks Martin Fowler's book Patterns of Enterprise Application Architecture covers solutions for subclassing tables: Single Table Inheritance Class Table Inheritance Concrete Table Inheritance These correspond to the options in the answer from @spencer7593, without being tied to Java & Hibernate. The Hibernate documentation has discussion of the options

What is the difference between ERD (Entity relationship diagram) and EERD (enhanced entity relationship diagram)? Martin Thoma Entity-Relationship model You have relationships ( image source ) and attributes ( image source ) that can also be primary keys ( image source ) Enhanced entity–relationship model You have the same as with the ER model plus specialisation partitioning (which are multiple specialisations) generalisation aggregation keys are annotated differently: I would add that ER model is basic model which has all you need for relational algebra as it is (including ISA hierarchy -

I am creating a visual representation of my existing database with MySQL Workbench and I am able to synchronize the models with the "Database -> Synchronize Model..." menu. However, every time I synchronize (update) my model, I have to recreate the EER Diagram and rearrange all the tables. Is there a way to update or synchronize the EER Diagram as well? Thanks. Jeff B Database > Synchronize Model... Choose Stored Connection Select the Schemata Choose which to update: Model or Source (in your case, point arrows to Model) Are you by any chance using a MySQL DB engine that doesn't support foreign