Uber Uber Interview Question 03

Driver
Utilization
Rate

Calculate utilization rate = total trip time / total available time per driver.

Table Schema

Inspect
Table

interactive

Sample Data

Sample Input: driver_activity

Expected Output

SQL Editor

Waiting for query

Hints

Hint 01: Identify the grouping level required by the output.

Hint 02: Aggregate with COUNT, SUM, AVG, or a window function as needed.

Hint 03: Filter after aggregation with HAVING or after ranking with an outer query.

Solution

Solution is locked until you decide to reveal it. Try the editor first, then open this when you want the reference answer.

SELECT driver_id, ROUND(1.0 * SUM(trip_duration) / SUM(available_duration), 2) AS utilization_rate
FROM driver_activity
GROUP BY driver_id;

Explanation

Read the expected output columns to determine the final grain.

Aggregate or rank the input rows to calculate the requested metric.

Filter, sort, and alias the final columns to match the output.