SQL + Data Manipulation (SQL/Python) Interview Questions
Practice the exact questions companies are asking right now.
"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"
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Identify and Flag Bot Traffic in Online Forum
PVE +----------+-----------+ | memberId | timestamp | +----------+-----------+ | 101 | 169100123 | | 102 | 169100225 | | 101 | 16910030...
Find Top-5 Similar Rows
This question evaluates pairwise similarity matching, numerical feature comparison using mean squared error, null-value exclusion, and deterministic t...
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 recommended friend pairs by shared listening
Problem (SQL) You work on a music app and want to recommend new friend connections based on listening similarity. Tables Assume the following schemas:...
Clean and Merge Housing Data
This question evaluates data cleaning, type coercion, robust merge operations, and missing-data imputation skills within tabular datasets, emphasizing...
Compute SHOP spend share and model performance
You work on ads measurement. Advertisers can drive users to either Facebook Shop ('SHOP') or their own website ('WEBSITE'). After an ad is shown, you ...
Find top-paid employee per department
Given the following tables: 1) employees - employee_id INT PRIMARY KEY - employee_name VARCHAR 2) employee_department - employee_id INT - department_i...
Find the most-used app
You work on Oculus app engagement analytics. Tables user_activity - user_id (BIGINT) - date (DATE) — day of activity (assume UTC unless otherwise spec...
Solve three SQL problems (easy/medium/hard)
Answer the following SQL tasks of increasing difficulty: 1) Aggregation: Given Orders(order_id, customer_id, amount, order_date), return each customer...
Find top-paid employee per department
Tables Assume the company stores employee compensation by department assignment. employee_dept_salary - employee_id INT - employee_name VARCHAR - depa...
Pivot daily users and revenue by platform
You are given transaction-level data and need daily aggregates by platform. Input (Pandas DataFrame) df with columns: - file_date (DATE or string pars...
Find top buyer in earliest 10-year window
This question evaluates proficiency in data manipulation and analytical querying with SQL/Python, emphasizing date-based windowing, join operations, a...
Analyze document collaboration from CSV logs
You are given two CSV files exported from a document collaboration product. Data 1) doc_access.csv Each row represents a user accessing (viewing/editi...
Analyze Acquisition Channels for User Value and Retention
acquisition | user_id | acquire_channel | acquire_date | | 101 | organic | 2023-01-05 | | 102 | paid_search | 2023-01-06 | | 103 | social_media | 2023...
Identify Users with Specific Page Navigation Patterns
page_visits +------------+---------+---------+---------------------+ | visit_date | user_id | page_id | ts | +------------+---------+...
Identify Key Metrics for Monitoring Shipment Defects
shipment +-------------+----------+------------+---------+---------+ | shipment_id | order_id | ship_date | carrier | status | +-------------+------...
Query Active Loans by Borrower ID in SQL
loans +---------+------------+----------+-----------+---------------+ | loan_id | borrower_id| amount | status | payment_date | +---------+-----...
Calculate Conversion Rate from Ad Clicks to Page Visits
user_events | user_id | event_time | event_type | ad_id | |---------|----------------------|------------|-------| | 1 | 2023-01-01 10:...
Compute CTR for peak vs non-peak hours
This question evaluates a candidate's ability to compute time-based click-through rate metrics using SQL and data manipulation techniques, including j...
Convert multi-currency revenue to USD totals
This question evaluates a candidate's competency in converting multi-currency revenue into USD totals by aligning event dates with FX rates, handling ...