PART MARKING:  We will only mark TWO of the four questions below but you must submit answers to all four. We will choose the questions we mark randomly and we will supply you with model answers to all the questions.

Construct data models for the following specifications. Include an ERD and a list of relations (entity list). Your relations must show all attributes, primary keys and foreign keys. You must use the USQ (Finkelstein) methodology as described in your Study Book, the lectures and the tutorials.

Question 1

An ambulance driver may be assigned to many teams over time. A team comprises of a minimum of one driver but could have up to twelve.  For driver, we store the name, address and birth date. For team, we store the team id and the location. We also need to store the date a driver is assigned to a team, the date a driver leaves the team and the rating of the driver within the team.

Question 2

A course may have many prerequisite courses. A prerequisite must relate to only one course. A prerequisite is also a course. For course, we store the course number and course name.

Question 3

A course may have many prerequisite courses. A prerequisite may relate to many courses. A prerequisite is also a course. For course, we store the course number and course name. We would also like to store the level of the prerequisite for a particular course.

Question 4

A mattress must be assigned to a specific category but a category may apply to many mattresses. A mattress may be combined with many beds and a bed with many mattresses. A bed is made by one manufacturer but a manufacturer may make many beds. For mattress, we store the id number and brand name, while we store a category number and name for category. For bed, we store the brand name (unique), size, length and width. Each time a specific mattress is allocated to a bed, we need to store the comfort rating and the rating date.