can anyone draw these ER diagrams?
1. Construct an E-R diagram for a university registrar’s office. The office maintains data about each class, including the instructor, enrollment, time and place of class meetings. For each student pair, a grade is recorded
2. Construct an E-R diagram for a car-insurance company that has a set of customers, each of whom owns one or more cars. Each car has associated with it zero to any number of accidents. Also create a relational database for this.
3. Construct an E-R diagram for a hospital with a set of patients and a set of medical doctors. Associate with each patient a log of the various tests and examinations conducted.