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The company database keeps track of company s employee, department and projects. We store Employee s name, ssn , address, salary, gender, date of birth
The company database keeps track of companys employee, department and projects. We store Employees name, ssn address, salary, gender, date of birth and age. An employee is assigned to one department, but may work on several projects which are not necessarily controlled by the same department. A particular employee manages the department. Each department has a unique name, unique number and several locations. The department controls number of projects each of which has a unique name, unique number and a single location. We want to keep track of the dependents of each employee for insurance purpose. We keep each dependents first name, sex, birth date and relationship to employee.
ER diagrams should not be like tables. Entities should be shown as rectangles and Relationships should be shown as diamonds. If there is a key constraint, it should be shown with an arrow from entity to relationship. If there is total participation, it should be shown with a thick arrow. Weak entities should also be indicated in the diagram.
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