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Entity-Relationship diagrams for Case Study 1

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This is the first of three case studies that are used to guide the reader through the six steps outlined in Six-Step Relational Database Design™. Some of the outputs of the six step database design process are depicted here. Get a copy of Six-Step Relational Database Design™ to get the details of all six steps.

Scenario

Below is the scenario for Case Study 1 as described in Six-Step Relational Database Design™:

A small accounting firm wants a simple HR application that will help it to keep track of its employees, their positions, allowances, salary scales, and which company vehicles their employees drive.

The application must keep track of all the positions at the firm, the employees filling these positions, the allowances for these positions, the salary scales for these positions, and the company vehicles assigned to these positions.

 

Entity-Relationship diagrams

Below is the Simplified Entity-Relationship diagram that is output from Step 3 of the six step database design process as described in Six-Step Relational Database Design™:

Case Study 1 simplified E-R diagram

 

Below is the Detailed Entity-Relationship diagram that is output from Step 5 of the six step database design process as described in Six-Step Relational Database Design™:

Case Study 1 detailed E-R diagram

 

View the resulting Crow's Foot Relational-Model diagram for Case Study 1.