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Use the following business rules to create a Crow's Foot ERD. Write all appropriate connectivities and cardinalities in the ERD.


Exercise 1: ERD 

Use the following business rules to create a Crow's Foot ERD. Write all appropriate connectivities and cardinalities in the ERD. 

  • A department employs many employees, but each employee is employed by only one department. 

  • Some employees, known as "rovers," are not assigned to any department. 

  • A division operates many departments, but each department is operated by only one division. 

  • An employee may be assigned many projects, and a project-may have many employees assigned to it. 

  • A project must have at least one employee assigned to it. 

  • One of the employees manages each department, and each department is man-aged by only one employee. 

  • One of the employees runs each division, and each division is run by only one employee. 

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Answer #1

Entity Relationship Diagram

Data model according to the business rules given

Connectivity in the Entity relationship Diagram

Relationship between DIVISION and DEPARTMENT – 1: M relationship

Relationship between DEPARTMENT and EMPLOYEE - 1: M relationship

Relationship between EMPLOYEE and PROJECT- M:N relationship

Cardinalities are shown in the above diagram of data model between the identities.

There is M:N relationship between Employee and Project.

Spiting this M:N relationship between Employee and project and creating Crow’s Foot ERD.

step: 2 of 2

Crow’s Foot ERD – Based on the above data model the ERD is shown below:

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