Can I read Enhanced ERD and Specialization Concepts on EtoBox?
Enhanced ERD and Specialization Concepts by Jahanzaib Niazi is a document available to read on EtoBox.
What is Enhanced ERD and Specialization Concepts about?
The document discusses enhancing an entity relationship diagram (ERD) to better model employees who can have different employment types (permanent, contract, or daily). It proposes using a superclass of "Employee" with subclasses for each employment type. This allows common attributes like employee number to be defined once, while optional attributes like monthly or daily salary are defined only for relevant subclasses. The document also discusses constraints like whether subclasses must be mutually exclusi
- Author
- Jahanzaib Niazi
- Language
- EN