Relation Er Diagram. Entity Relationship Diagram also known as ERD ER Diagram or ER model is a type of structural diagram for use in database design. An Entity Relationship ER Diagram is a type of flowchart that illustrates how entities such as people objects or concepts relate to each other within a system.
EER diagram is a visual representation of data based on the EER model that is an extension of the original entity-relationship ER model. Entity-Relationship ER Diagrams 38 EmployeeDEPENDENTSexDNameDBirthdateRela7onshipDepartment EMPLOYEE SSN Sex Name Salary Birthdate Address FName Works_On MI LName Hours Project ision Supervisor Supervisee 1 N. We will use the student-section-course database as an example.
It can use the same name and same set of attributes as the entity set.
Entities attributes and relationships. Choose one of the keys as primary key of the relation. An entity relationship diagram ERD shows the relationships of entity sets stored in a database. Converting an E-R diagram to a relational schema Below describes a mechanical procedure for converting an E-R diagram to a relational schema.