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You’re about to read the 3 latest Uber SQL interview questions and solutions asked by Uber for data science, data analyst, business intelligence engineer, data engineer, and business analyst positions.
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Uber SQL Interview Question 72: Time elapsed between trips
Prompt: Write a query to find for each user that has taken at least two trips with Uber, what is the time that elapsed between first trip and second trip?
Table: sign_ups +--------+----------------+ |rider_id|signup_timestamp| +--------+----------------+ |1 |2022-03-01 | |2 |2022-03-01 | |3 |2022-03-01 | |4 |2022-03-01 | |5 |2022-03-01 | +--------+----------------+Table: trips +-------+--------+---------+--------------+ |trip_id|rider_id|driver_id|trip_timestamp| +-------+--------+---------+--------------+ |1 |1 |2 |2022-02-01 | |1 |2 |2 |2022-03-11 | |1 |1 |2 |2022-04-01 | |1 |1 |2 |2022-05-21 | |1 |2 |2 |2022-06-01 | |1 |3 |2 |2022-07-31 | +-------+--------+---------+--------------+
Output
+---------+------------------------+---------------------+
|rider_id |trip_timestamp |time_between_two_trip|
+---------+------------------------+---------------------+
|1 |2022-05-21T00:00:00.000Z|null |
|1 |2022-04-01T00:00:00.000Z|{"days":50} |
|1 |2022-02-01T00:00:00.000Z|{"days":59} |
|2 |2022-06-01T00:00:00.000Z|null |
|2 |2022-03-11T00:00:00.000Z|{"days":82} |
+---------+------------------------+---------------------+Solution
SELECT rider_id,
trip_timestamp,
lag(trip_timestamp, 1) OVER (PARTITION BY rider_id
ORDER BY trip_timestamp DESC) - trip_timestamp
AS time_between_two_trip
FROM trips
WHERE rider_id in
(SELECT rider_id
FROM trips
GROUP BY rider_id
HAVING COUNT (*) >1)
Uber SQL Interview Question 57: Find the third order
Prompt: Write a query to find how many users placed their third order containing a product owned by the ATG (holding company) on or after 9/21/22? Only consider orders containing at least one ATG holding company product.
Table: brands +--------+----------+------------------+--------------------+ |brand_id|brand_name|holding_company_id|holding_company_name| +--------+----------+------------------+--------------------+ |1 |A5 |10 |Beam Suntory | |2 |A4 |9 |CDE | |3 |A3 |8 |ATG | |4 |A2 |7 |Chivas | |5 |A1 |6 |MMT | +--------+----------+------------------+--------------------+Table: orders +--------+-------+----------+--------+-----+--------+----------+--------+ |order_id|user_id|product_id|brand_id|price|quantity|date |store_id| +--------+-------+----------+--------+-----+--------+----------+--------+ |1 |111 |3 |1 |100 |2 |2022-09-21|12 | |2 |222 |7 |2 |123 |30 |2022-12-09|34 | |3 |222 |9 |1 |14 |1 |2020-05-02|435 | |4 |222 |11 |3 |140 |40 |2019-11-03|23 | |5 |333 |13 |5 |120 |15 |2019-10-01|45 | +--------+-------+----------+--------+-----+--------+----------+--------+
Output
+-------------+
|user_id |
+-------------+
|222 |
+-------------+Solution
WITH count_orders AS
(SELECT user_id,
count(order_id) AS total_orders
FROM orders
WHERE date::DATE >= '2019-09-21'::DATE
GROUP BY user_id)
SELECT user_id
FROM count_orders
WHERE EXISTS
(SELECT order_id
FROM orders o
LEFT JOIN brands b ON o.brand_id = b.brand_id
WHERE holding_company_name = 'ATG')
AND total_orders >= 3;
Uber SQL Interview Question 71: Find the latest timestamp for users who took at least one trip
Prompt: Write a query to find the latest trip timestamp for each user who took at least one trip.
Note: Order by rider id ASC”
Table: sign_ups +--------+----------------+ |rider_id|signup_timestamp| +--------+----------------+ |1 |2022-03-01 | |2 |2022-03-01 | |3 |2022-03-01 | |4 |2022-03-01 | |5 |2022-03-01 | +--------+----------------+Table: trips +-------+--------+---------+--------------+ |trip_id|rider_id|driver_id|trip_timestamp| +-------+--------+---------+--------------+ |1 |1 |2 |2022-02-01 | |1 |2 |2 |2022-03-11 | |1 |1 |2 |2022-04-01 | |1 |1 |2 |2022-05-21 | |1 |2 |2 |2022-06-01 | |1 |3 |2 |2022-07-31 | +-------+--------+---------+--------------+
Output
+---------+------------------------+
|rider_id |latest_trip_timestamp |
+---------+------------------------+
|1 |2022-05-21T00:00:00.000Z|
|2 |2022-06-01T00:00:00.000Z|
|3 |2022-07-31T00:00:00.000Z|
+---------+------------------------+Solution
SELECT rider_id,
max(trip_timestamp) AS latest_trip_timestamp
FROM trips
GROUP BY rider_id
ORDER BY rider_id;
Want to practice more Uber SQL interview questions like this with on-demand support and a dynamic SQL playground? Learn more here!
We’ve analyzed over 50,000 interviews from the latest data science, data analyst, data engineer, business analyst, and business intelligence engineer roles being filled by pre-IPO to Fortune 500 companies at Big Tech Interviews (BTI) to curate an exclusive list of the latest SQL interview questions and solutions so you can ace your next interview!
