Use the following business rules to create a Crow’s Foot ERD. Write all appropriate connectivities and cardinalities in the ERD. a. A department employs many employees, but each employee is employed by one department. b. Some employees, known as “rovers,” are not assigned to any department. c. A division operates many departments, but each department is operated by one division. d. An employee may be assigned many projects, and a project may have many employees assigned to it. e. A project must have at least one employee assigned to it. f. One of the employees manages each department, and each department is managed by only one employee. g. One of the employees runs each division, and each division is run by only one employee. Given these data requirements, design a logical/relational data model for this company. Use Microsoft Visio for your diagrams. You can add substantial detail to your data model by including sample attributes for each of the entities. Specify primary and foreign keys for each relation. Create composite entities if necessary (for many-many relationships) Note: It is reasonable to assume that many of the relationships are optional and that some are mandatory. When in doubt, assume an optional relationship.
Use the following business rules to create a Crow’s Foot ERD. Write all appropriate connectivities and cardinalities in the ERD. a. A department employs many employees, but each employee is employed by one department. b. Some employees, known as “rovers,” are not assigned to any department. c. A division operates many departments, but each department is operated by one division. d. An employee may be assigned many projects, and a project may have many employees assigned to it. e. A project must have at least one employee assigned to it. f. One of the employees manages each department, and each department is managed by only one employee. g. One of the employees runs each division, and each division is run by only one employee. Given these data requirements, design a logical/relational data model for this company. Use Microsoft Visio for your diagrams. You can add substantial detail to your data model by including sample attributes for each of the entities. Specify primary and foreign keys for each relation. Create composite entities if necessary (for many-many relationships) Note: It is reasonable to assume that many of the relationships are optional and that some are mandatory. When in doubt, assume an optional relationship.
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