Draw and ER diagram of the following :

The ER diagram is of a database for part of the work of the HR (Human Resources) Department in a company whereby HR wants to keep track of the job history of employees during their tenure in the company. Specific details that the database shall record are:

1. Every Employee is described by an empID (unique), and name.

2. Every job is described by a jobID (unique), and job title.

3. Every employee is qualified to perform at least one job. However, the company is fortunate in that it has at least one qualified employee for every job it has. HR wants to keep track of who is qualified for what job(s) and the level of such qualification (e.g. low, medium, high, etc.)

4. An employee is appointed to one job only during any moment in time. HR wants to keep track of current and past appointments of employees to jobs. An appointment is described by a start date, end date, start salary, and end salary. (Of course the end date and end salary will be null for the current appointment of the employee).

5. An employee is given an appointment based upon a nomination from another employee. HR wants to keep track of who nominated whom for what appointment. Of course, over time, a nominator may have written several nominations for several appointments.

HINT: The ER will require a weak entity that has two owner entities.