Entity Relationship Diagram

Entity Relationship Diagram (ERD) In the Entity Relationship Diagram: Entities generally correspond to persons, objects, locations, events, etc. Examples are employee, vendor, supplier, materials, warehouse, delivery Cited from Website Enitity Relationship Diagram: http://elearning.tvm.tcs.co.in/re/re/3_3_ERD.htm In this approach entities can be: Who? What Where? When? persons, objects locations events employee materials warehouse delivery vendor supplier The good news is that this approach is abstract enough to cover all these instances. The bad news is that this approach is not differentiated enough to separate subsumptive, determinative and ordinal relations. Has - Forms One - Many