Relational Database Design and Modeling for Software Engineers
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Creating an ER Diagram for Employee Management System

Everything in this chapter so far has been one symbol at a time. Now we use all of them on one requirement, from the written brief to a finished diagram, and then to tables.

The requirement

A company asks for an employee management system. The brief is short.

  1. Record the information of each employee.
  2. Record the payroll information for each employee.
  3. Each employee receives a payroll record.
  4. Each employee is linked to exactly one payroll record, and each payroll record belongs to exactly one employee.

Four sentences

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