Entity Relationship Model Vs Relational Model. The relational model is depicted in the form of the entity relationship diagram. Comparatively it is less easy to derive a relation between tables in relational model.
The relational model is depicted in the form of the entity relationship diagram. Entity relation design is dependant on the idea of actual community entities as well as the relationship between them. The relationships in an e r model are explicitly defined while they are implicit in a relational model.
This depends upon the use we want to make of address information and the semantics of the data if we have several addresses per an employee address must be an entity since attributes cannot be set valued if the structure city street etc is important e g we want.
Entity relationship modeling e rm schemas are just a way of organizing but under using and under specifying but with misunderstanding relational tables and constraints. Comparatively it is less easy to derive a relation between tables in relational model. Relational model describes data in a table as domain attributes tuples. Admission admission admission date admission type number of days o result o admission cost.
