Garden Glory wants to expand its database applications beyond the recording of property services. The company still wants to maintain data on owners, properties, employees, services and the service work done at the properties, but it wants to include other data as well. Specifically, Garden Glory wants to track equipment, how it is used during services, and equipment repairs. In addition, employees need to be trained before they use certain equipment, and management wants to be able to determine who has obtained training on which equipment.
With regard to properties, Garden Glory has determined that most of the properties it services are too large and complex to be described in one record. The company wants the database to allow for many subproperty descriptions of a property. Thus, a particular property might have subproperty descriptions such as Front Garden, Back Garden, Second- Level Courtyard, and so on. For better accounting to the customers, services are to be related to the subproperties rather than to the overall property.
A. Draw an E-R data model for the Garden Glory database schema shown in Chapter 3’s “Garden Glory Project Questions.” Use the IE Crow’s Foot E-R model for your E-R diagrams. Justify the decisions you make regarding minimum and maximum cardinality.
B. Extend and modify the E-R data model to meet Garden Glory’s new requirements. Use the IE Crow’s Foot E-R model for your E-R diagrams. Create appropriate identifiers and attributes for each entity. Justify the decisions you make regarding minimum and maximum cardinality.
C. Describe how you would go about validating the model in part B.
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