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Scenario and Database Model: InstantRide
InstantRide is the new ride sharing application in the city and it has just started its operations. With the help of the InstantRide mobile application, the users request a ride with their location. Drivers and cars are assigned to the request; and then the driver picks up the user to ride their requested location. Information for the users, drivers and cars are stored in the database as well as the travel transactions.
In the USERS table, information for the users are stored with their first name, last name and email:
In the DRIVERS table, all the drivers in the InstantRide are stored with their name, driving license number and check and rating information:
In the CARS table, all the cars in the InstantRide system are kept with the license plate, model and year:
Finally, the transactions of the rides are stored in the TRAVELS table. For each travel, start and end time with location are stored. In addition, the involved driver, car and user are listed for each drive. Price and discount information are also available in the database:
Task 1:
The InstantRide received some traffic violation tickets from the government. The Legal team of InstantRide requires the travel information of the respective drivers along with corresponding Driving License IDs to proceed further. In addition, the team wants to include the drivers without travel information in the system yet for the completion of driver list. Therefore, you need to return DRIVER_FIRST_NAME, DRIVER_LAST_NAME, DRIVER_DRIVING_LICENSE_ID, TRAVEL_START_TIME, TRAVEL_END_TIME information from the DRIVERS and TRAVELS data connected by LEFT JOIN.
Task 2:
The InstantRide Management team considers setting up a Lost & Found inventory. In order to start the setup, the team requires the detail of users with their travel start and end times. The team wants to track potential list of users who may have forgotten their items on the cars. Therefore, you need to return USER_FIRST_NAME, USER_LAST_NAME, TRAVEL_START_TIME, TRAVEL_END_TIME information from the USERS and TRAVELS tables connected inside a JOIN statement by the USING function and USER_ID field.
Task 3:
The InstantRide Finance team wants to collect the price and discount information with the driver names for each travel in the system. You need to return the TRAVEL_ID, DRIVER_FIRST_NAME, DRIVER_LAST_NAME, TRAVEL_PRICE, and TRAVEL_DISCOUNT information from the TRAVELS and DRIVERS tables combined over DRIVER_ID field with the ON keyword.
Task 4:
The InstantRide Driver Relationship team wants to create groups for drivers according to their ratings such as 3+ or 4+. For instance, a driver with the rating 3.8 will be 3+; whereas a driver with the rating 4.2 will be 4+. You need to return a two column output with DRIVER_ID and DRIVER_RATING which has first FLOOR applied and then CONCAT with + sign for all drivers with a rating greater than 0.
Task 5:
The InstantRide User Satisfaction team are looking forward to creating discounts for the users. However, the team suspects that there could be duplicate users in the system with different emails. Check for the users with their names and surnames for potential duplicates. Therefore, you need to JOIN the USERS table with USERS table and compare for equality of USER_FIRST_NAME and USER_LAST_NAME and difference in USER_ID fields.
Tasks:
Query all drivers with and without travel data.
Query user travel times.
Calculate each user's price and discount information.
Create groups of drivers according to their ratings.
Check for duplicate driver accounts.
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