Question
Fast is a new car rental company that just started and is growing fast in several cities. The general manager decided to use a DBMS
Fast is a new car rental company that just started and is growing fast in several cities. The general manager decided to use a DBMS to help track the daily operations. Consider the following relation that links between the city where a branch is located, the offered car make and type, the number of cars available, the earliest date a car is available and the daily rental cost for the particular car make and type.
BranchCars
BranchCity | Make | Type | NrAvail | EarliestAvail | DailyRent |
Chilliwack | Toyota | 4Dr Sedan | 4 | 16/12/2023 | $19 |
Chilliwack | Toyota | 2Dr Sport | 2 | 11/11/2023 | $44 |
Abbotsford | BMW | 2Dr Sport | 3 | 21/09/2023 | $80 |
Abbotsford | Mazda | 2Dr Sport | 2 | 11/11/2023 | $80 |
Langley | Mercedes | 4Dr Sedan | 2 | 30/11/2023 | $85 |
Surrey | Toyota | 4Dr SUV | 4 | 01/11/2023 | $85 |
Abbotsford | Toyota | 4Dr SUV | 1 | 10/10/2023 | $20 |
Surrey | Jeep | 4Dr SUV | 1 | 10/10/2023 | $66 |
Langley | Lincoln | Limousine | 1 | 09/11/2024 | $290 |
Write a relational algebra expression and the corresponding SQL query for each of the following:
1. List the branches where more than 2 cars are available before 12/12/2023.
2. List the branches that offer more than one Type of car.
3. List the average daily rent for each car Type.
4. List pairs of branches which offer similar car Makes regardless of Type, availability date or number of available cars .
5. Find the branch that offers the cheapest vehicle.
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