Top Driver Earnings Per Hour | Dataford Interview Questions

RideNow wants to identify its highest-efficiency drivers based on earnings per hour in the previous calendar month. Write a SQL query to return the drivers whose earnings per hour place them in the top 10% for that period.

Requirements

Use only trips that were completed in the previous calendar month.
For each driver, calculate:
- total earnings as the sum of fare_amount
- total hours worked as the sum of trip duration in hours
- earnings per hour = total earnings / total hours worked
Exclude drivers whose total worked hours are 0 or NULL.
Return only drivers in the top 10% by earnings per hour using a ranking or percentile approach.
Output driver_id, driver_name, total_earnings, total_hours, and earnings_per_hour, ordered by earnings_per_hour descending.

Schema

drivers

Column	Type	Description
driver_idPK	INT	Unique identifier for each driver
driver_name	VARCHAR(100)	Driver full name
city	VARCHAR(50)	Driver's primary city
active_status	VARCHAR(20)	Current status of the driver

trips

Column	Type	Description
trip_idPK	INT	Unique identifier for each trip
driver_id	INT	Driver assigned to the trip
trip_status	VARCHAR(20)	Trip completion status
started_at	TIMESTAMP	Trip start timestamp
ended_at	TIMESTAMP	Trip end timestamp
fare_amount	DECIMAL(10,2)	Fare earned from the trip

Your question is Top Driver Earnings Per Hour. Start with the requirements and the two tables in the Question tab.

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