ER diagrams can be mapped to relational schema, that is, it is possible to create the relational schema using the ER diagram. There are several processes and algorithms available to convert ER Diagrams into Relational Schema. Some of them are automated and some of them are manual. We may focus here on the mapping diagram contents to relational basics. ER diagrams mainly comprise of −

1.Entity and its attributes.

2.Relationship, which is an association among entities.