Create an ER diagram for each of the following descriptions: (a) Each company operates four departments, and
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(a) Each company operates four departments, and each department belongs to one company.
(b) Each department in part (a) employs one or more employees, and each employee works for one department.
(c) Each of the employees in part (b) may or may not have one or more dependants, and each dependant belongs to one employee.
(d) Each employee in part (c) may or may not have an employment history.
(e) Represent all the ER diagrams described in (a), (b), (c), and (d) as a single ER diagram.
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Related Book For
Database Systems A Practical Approach to Design Implementation and Management
ISBN: 978-0132943260
6th Edition Global
Authors: Thomas Connolly, Carolyn Begg
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