CQ Air Conditioning Services Case Study - Engineering Assignment Help

Assignment Task :

Objectives
• To develop a conceptual data model diagram
• To perform logical design (optional)
 

Assignment Specification
In this assignment, you need to perform the following tasks for the given case study:
• Draw an Entity Relationship (ER) diagram
• Perform logical design (optional)
• Create 3NF Relations (optional)
Please note that the above mentioned optional components, logical design and 3NF relations, will not be marked, however those tasks are expected to enrich your skills in the creation of database in future. 
 

Case Study
CQ Air conditioning services (CQAC) perform installation and repair activities of air conditioning units in their customers’ premises.  When a new customer requests for an installation, CQAC collects their personal details such as name, address, contact phone, email address, etc., Most of their installations are carried out in the home premises of their customers, however, some customers request them to install the air conditioning units at other premises such as their investment units/houses or offices etc., Hence, they also collect the contact person and address details of the premises where the installation has to be carried out.
Subsequently, one of CQAC employees inspects the premises and provide installation-options to the customer. The current installation-options that they provide are ducted, wall mounted and window mounted air conditioning.  Once these options are finalized by the customer, a purchase order/agreement is generated by them and a copy is given to the customer.  Currently 40% of the total cost is collected as advance payment from the customers.
After installing the air conditioning units by their employees, CQAC conducts an inspection visit, settles the issues if any and collects the remaining cost of the installation.  
Whenever CQAC receives a repair request from their customers, the details that are related to the problem are obtained and a possible date for a repair visit is informed to them.  After the completion of the repair work by their employees, an invoice is issued to the customer.  
 

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