I have to create an ERD for the database described below using Chen ERD Notation. You can use any ERD drawing tool that you are comfortable with as long as it will produce a file that you can submit to the dropbox. All assignments will need to be submitted in Word or pdf format.
EverFail is a quick oil-change and lube business. Although customers bring in their cars for what is described as “quick oil changes”, EverFail also replaces windshield wipers, oil filters and air filters, subject to customer approval. The invoice contains the charges for the oil used, all parts used and a standard labor charge. When the invoice is presented, customers pay cash, use a credit card or give a check. EverFail does not extend credit. EverFail’s database is to be designed to keep track of all components in all transactions. Given the high parts usage of the business operations, EverFail must maintain careful control of its parts (oil, wipers, oil filters and air filters) inventory. Therefore, if parts reach their minimum on-hand quantity, the part in question must be re-orderd from an appropriate vendor. EverFail maintains a vendor list, which contains both the vendors actually used as well as potential vendors. Periodically EverFail mails updates to customers based on the dates of the car’s last service. EverFail also tracks each customer’s car mileage.