Software Engineer Data Manipulation (SQL/Python) Interview Questions
Practice 55 real Data Manipulation (SQL/Python) interview questions for Software Engineer roles. From companies including Amazon, NVIDIA, DoorDash, Akuna Capital, Stripe.
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Compute dasher payout from API data
Given a REST endpoint GET /payout that returns each delivery’s components (base pay, distance/time bonuses, promotions, tips, fees, adjustments, taxes...
Debug a Hive query
You are given a prewritten Hive SQL query that produces incorrect results. Describe how you would debug it: identify logical errors (e.g., join condit...
Compute unique visitors per department from clicks
Given tables Products(product_id, department, category, subcategory) where department > category > subcategory form a hierarchy, and ClickLog(user_id,...
Find users with multi-country successful logins
Given a table login_attempts with columns: user_id (TEXT), timestamp (TIMESTAMP), status (TEXT), and country (TEXT), write an SQL query to return the ...
Manipulate time-series with Pandas groupby
Given a DataFrame events(user_id, event_type, ts_utc, revenue): 1) Parse ts_utc as timezone-aware, convert to America/Los_Angeles, and handle DST tran...
Compute courier pay with peak-hour rules
Implement compute_pay(deliveries) to calculate a delivery driver's daily pay from a list of delivery records. Each record may include times, miles, ba...
Calculate minutes between two time strings
Given two times t1 and t2 in "HH:MM" 24-hour format on the same day with t2 > t1, compute the difference in minutes. Show how you parse the strings, c...
Parse logs and query by time
Implement a parser that converts raw log lines into structured records with fields {timestamp, level, message}. Build an API to support: (a) insert(lo...
Answer SQL MCQs with reasoning
Answer multiple-choice questions covering SQL topics: INNER vs LEFT vs RIGHT JOIN semantics; GROUP BY and HAVING; NULL handling in comparisons and agg...
Implement pagination and clump grouping
You are given two pre-implemented APIs: ( 1) fetch_activities(page: int) -> { total_pages: int, activities: [ { activity_id: string, type: string, use...
Write PostgreSQL updates with date filters
Write PostgreSQL statements to: ( 1) update a flight's price and set updated_at correctly; ( 2) upsert a booking record with conflict handling; ( 3) s...
Implement a pivot table transformation
Given a dataset of transactions with columns: user_id (string), category (string), subcategory (string), amount (float), ts (ISO timestamp), implement...
Write SQL to Join Merchants and Triple Restaurant Points
You are given: ( 1) a CSV file merchants.csv with columns: merchant_name, merchant_code, category; ( 2) a database table transactions(user_id INT, mer...
Design payment-to-invoice matcher with priorities
Design and implement a payment-to-invoice matcher. Inputs: (a) invoices, a list like ["invoice-id-1, 10000, 2022-01-01", "invoice-id-2, 30000, 2022-01...
Implement 2D convolution using NumPy slicing
Implement 2D convolution on a 4×4 input and a 3×3 filter with stride 1 using NumPy. Avoid explicit Python loops by relying on array slicing, broadcast...
Implement a gig worker payout calculator
Implement a payout calculator for gig workers (e.g., delivery drivers). Given a list of completed orders with timestamps, distances, and tips, plus po...
Find returning users from access logs
Given a large user access log, parse it and identify which user_ids are returning customers—i.e., they have at least one visit on two or more distinct...
Evaluate SQL expressions for zero
Which of the following SQL expressions evaluate to 0? Evaluate each independently, justify the result, and note any dialect-specific behavior (e.g., M...
Implement Spring MVC to find top-enrolled course
Implement a Spring MVC service that returns the course with the highest number of enrolled students from a relational database pre-populated by provid...
Implement scalable word count locally
Write a function that reads a very large text file and outputs the frequency of each word. Define your tokenization and normalization rules (case fold...