2023 Question Consider lucky Rent A Car s website which contains its database as described in figure 5 18 Describe in detail the | Assignment Collections
Computer Science 2023 A+ Answers
2023 Question Consider lucky Rent A Car s website which contains its database as described in figure 5 18 Describe in detail the | Assignment Collections
Question
Consider lucky Rent-A-Car’s website, which contains its database, as described in figure 5.18. Describe, in detail, the steps taken in both hardware and software to reach the database when a customer is making a reservation for rental car over the web.
Figure 5. 18 shows the relationship database for the lucky Rent-A-Car example described earlier. There is a one- to-many relationship from manufacturers to cars and another one- to- many relationship from cars to maintenance events. The former requires the manufacturer primary key. Manufacture name, to be placed in the car relation as a foreign key. The latter requires the car primary key. Car Serial Number, to be placed in the Maintenance relation as a foreign key. The many- to- many relationship among cars and customers requires the creation of a new relation, the rental relation. Each record of the Rental relation records the rental of a particular car by particular customer. Note that the combination of the Car Serial Number and Customer Number attributes is not sufficient as the primary key of the rental relation. A given customer might have rented a given car more than once. Adding Rental Date to the primary key achieve the needed uniqueness.
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