Central Repairs is a new motor repairs facility set up this year. It needs to store...

 

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Central Repairs is a new motor repairs facility set up this year. It needs to store data on all cars and owners that pass through its premises as well as details of all mechanics that work there. It also has to keep records on work carried out that may have been issued to each vehicle. The repairs facility wishes to store the following data about the Owners, Owner ID, Owner name, address, and contact number. For each mechanic, it wishes to store ID number, name, and year of qualification. address and contact number. For each car it requires the following information to be stored its registration number colour, engine capacity, and manufacturer. For each Repair, it requires to store Repair ID, Fixed/Not Fixed, and Cause of fault. When the car is repaired, an invoice of work completed is assigned to the repair. Thus only one repair can generate one invoice and each invoice is generated by one repair. If the car cannot be repaired, no invoice will be created. For each Invoice, it stores Invoice ID, Invoice Date, Invoice Details and Amount. Each invoice needs to be signed off by an employee. There are a number of mechanics working on a particular car repair and each mechanic could work on one or more than one cars each day. (a) List the entities present in the above specification. (b) (c) (d) List the relationships that exist between these entities? Draw an Entity Relationship (ER) diagram to represent the above scenario. Develop a relational schema for your ER diagram. (2.5 marks) (2.5 marks) (10 marks) (10 marks) Total (25 marks) Central Repairs is a new motor repairs facility set up this year. It needs to store data on all cars and owners that pass through its premises as well as details of all mechanics that work there. It also has to keep records on work carried out that may have been issued to each vehicle. The repairs facility wishes to store the following data about the Owners, Owner ID, Owner name, address, and contact number. For each mechanic, it wishes to store ID number, name, and year of qualification. address and contact number. For each car it requires the following information to be stored its registration number colour, engine capacity, and manufacturer. For each Repair, it requires to store Repair ID, Fixed/Not Fixed, and Cause of fault. When the car is repaired, an invoice of work completed is assigned to the repair. Thus only one repair can generate one invoice and each invoice is generated by one repair. If the car cannot be repaired, no invoice will be created. For each Invoice, it stores Invoice ID, Invoice Date, Invoice Details and Amount. Each invoice needs to be signed off by an employee. There are a number of mechanics working on a particular car repair and each mechanic could work on one or more than one cars each day. (a) List the entities present in the above specification. (b) (c) (d) List the relationships that exist between these entities? Draw an Entity Relationship (ER) diagram to represent the above scenario. Develop a relational schema for your ER diagram. (2.5 marks) (2.5 marks) (10 marks) (10 marks) Total (25 marks)