36+ Design Multivalued Attribute In Er Diagram Example Download Zip Background. The book says more or less that given an entity e with a primary key p, a multivalued attribute e attached to an er diagram is mapped to a a table of its own with a primary key composed of p and the attribute value(s) a. An er model is a design or blueprint of a database that can later be implemented as a database.
***here are some rules for if there are multivalued attributes you have to make a new relationship with a suitable name and write.
Er diagrams are used to sketch out the design of a database. An attribute in er diagram examples, is represented by an ellipse. If, on the other hand, an employee can have multiple cards but a card. Once designing er diagram is complete, we need to put it into logical structure.