Top Cities by Ride Growth | Dataford Interview Questions

Welcome to the SQL screen.

The question is on your right: Top Cities by Ride Growth. Read through the requirements and the three tables first.

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Problem

SwiftRide wants to identify which cities are growing fastest in completed rides month over month. Write a SQL query to return the top cities by ride growth rate for each month.

Requirements

Count completed rides per city per month.
Compare each city-month to the previous month for the same city.
Calculate growth rate as (current_month_rides - previous_month_rides) / previous_month_rides * 100.
Return only months where the previous month exists and previous month rides are greater than 0.
For each month, rank cities by growth rate descending and return the top 2 cities.

Schema

cities

Column	Type	Description
city_idPK	INT	Unique city identifier
city_name	VARCHAR(100)	City name
region	VARCHAR(50)	Operating region for the city

drivers

Column	Type	Description
driver_idPK	INT	Unique driver identifier
city_id	INT	Driver's assigned city
driver_name	VARCHAR(100)	Driver full name
status	VARCHAR(20)	Driver status such as active or inactive

rides

Column	Type	Description
ride_idPK	INT	Unique ride identifier
driver_id	INT	Driver associated with the ride
rider_id	INT	Rider identifier
ride_date	DATE	Date the ride occurred
ride_status	VARCHAR(20)	Ride status such as completed or cancelled
fare_amount	NUMERIC(10,2)	Fare charged for the ride