Elements Of ER Model Elements Of ER Model: We know that E-R model describes the data as entities, attributes and relationship between entities. So the major elements of E-R model…
Composite Attribute: The attribute of an entity that can be divided into smaller component is called composite attribute. Each component also represents simple attribute with independent meaning in the elements of the E-R Model of the same data file. For example student’s name can be divided into first name, middle name and last name. Similarly student’s address can be divided into Zip code, city, street address etc.It is one of the famous element in the Elements of ER Model.
Each entity has a set of attributes associated with it. An attribute is a named property or characteristic of an entity that describes it in the E-R Model of the data file of the organization. An entity may have many attributes. For example, a student may have the following attribute name, roll number, height, class, address, color etc. In E-R diagram an attribute is represented by placing its name in an ellipse shape or oval shape.