Advanced Database Modeling

Chapter $5-$ Practice Lab

Given the following business scenario, create a Crow$$s Foot ERD using a

specialization hierarchy if appropriate.

Granite Sales Company keeps information on employees and the departments

in which they work. For each department, the department name, internal mail

box number, and office phone extension are kept.

A department can have many assigned employees, and each employee is

assigned to only one department. Employees can be salaried, hourly, or work

on contract. All employees are assigned an employee number, which is kept

along with the employee$$s name and address.

For hourly employees, hourly wages and target weekly work hours are stored;

for example, the company may target $40$ hours$/$week for some employees, $32$

for others, and $20$ for others. Some salaried employees are salespeople who

can earn a commission in addition to their base salary.

For all salaried employees, the yearly salary amount is recorded in the system.

For salespeople, their commission percentage on sales and commission

percentage on profit are stored in the system.

For example, John is a salesperson with a base salary of $$50,000$ per year plus

a $2$ percent commission on the sales price for all sales he makes, plus another

$5$ percent of the profit on each of those sales. For contract employees, the

beginning date and end date of their contracts are stored along with the billing

rate for their hours.