$($please draw it out as well also do not forget the specializations and jointness constraints$)$ Please develop an EER Model for the following situation. Your EER diagram must be

complete, meaning that all necessary information must be presented. Make appropriate

assumptions if necessary and clearly state them. The appropriateness of your assumption

will be evaluated.

Hints: Are provided to help you form your logic. Please be advised such helpful hints

may not be present for your project or exams. So please learn and clear any questions

now.

Upload the PDF file of your EER models by the due date and time

Situation

An International School of Technology $($IST$)$ has hired you to create a database system to

assist in its daily operation. After several interviews with the administrators, you have

come up with the following list of entities, attributes, and initial business rules:

$1)$ IST depends on a large number of employees for its continued success. There are

three groups of employees on whom IST is most dependent: Administrators,

Instructors and Staff. Some common attributes are shared by all employees: Emp$\_$ID

$($identifier$),$ Name, Address, City$/$State$/$Zip$,$ Birth$\_$Date, and Phone.

Hint: Is this a supertype $/$ subtype situation?

Hint: Where does the common attributes go$?$

Hint: Could there be employees other than the three most dependent groups?

$2)$ Each of the three groups of employees has at least one unique attribute of its own.

Staffs have Certificate, Instructors have Expertise and Rank, and Administrators have

position. An employee must belong to at least one of these groups.

Hint: Can an employee belong to more than one group?

$3)$ Room is identified by Building$\_$ID and Room$\_$NO and also has a Capacity. There are

the two different kinds of rooms: Classroom and Office. At a given time, a room must

be exactly one of these subtypes. An office may be shared by multiple employees, but

an employee cannot have more than one office.

Hint: Try to use the above hints $(1$&$2)$ and apply them to this situation.

$4)$ Timeslot has identifier TSIS and has attributes DayofWeek, StartTime, and EndTime.

$5)$ Course has identifier CourseID and has attributes CourseDescription and Credits.

Courses can have one, none, or many prerequisites. Courses also have one or more

sections.

Hint: What kind of a relationship is $$pre$-$requisite$($unary$,$ binary or ternary$)?$

Hint: Would the pre$-$requisite of a course be present in the course table?

$6)$ Section has identifier SectionID and an attribute EnrollmentLimit.

After some further discussions, you have come up with some additional business rules to

help you create the initial design:

$7)$ A section can be scheduled for no classroom or many classrooms for semesters.

However, one classroom can participate in many schedules, one schedule, or no

schedule; one time slot can participate in many schedules, one schedule, or no

schedules. You are required to keep track of semester and years of each schedule.

Hint: What kind of a relationship is $$schedule$($unary$,$ binary, or ternary$)?$

Hint: How many entities are required to schedule?

Hint: How do you keep track of schedule details? Is there an entity specifically for

this purpose?

$8)$ An instructor teaches one, none, or many sections of a course scheduled in a

particular semester. Each section of a course scheduled in a seminar has only one

instructor.