Data Manipulation (SQL/Python) Interview Questions
Practice the exact questions companies are asking right now.
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Write SQL for reply-based recipient metrics
You work on a social product and are given two tables. Assumptions (use these unless you state otherwise): - All timestamps are in UTC. - A “reply” is...
Count Recent High-Volume Call Users
Given the following tables: users - user_id BIGINT - country STRING - is_active BOOLEAN calls - call_id BIGINT - initiated_at TIMESTAMP - caller_id BI...
Compute ads revenue by geography in SQL
You have ad delivery logs for a shop-ads system. Tables ad_impressions - impression_id STRING (PK) - ts TIMESTAMP (UTC) - user_id STRING - shop_id STR...
Write SQL for CTR and Revenue
You are given the following tables: ads( ad_id BIGINT, advertiser_id BIGINT, ad_type VARCHAR, -- values include direct and brand ad...
Write SQL for video-call recipients and FR activity
Given the schema and samples below, write ANSI‑SQL to answer both questions. Assume dates are stored in UTC. Today is 2025-09-01, so “yesterday” is 20...
Write SQL for repeat churn
Write a SQL query to measure the performance of a free-month promotion experiment. Assume experiment_users already contains only users who were eligib...
Transform DataFrame and compute diff-in-diff
You are given a pandas DataFrame df with the following columns: - unit_id (string): entity identifier (e.g., user, city, driver) - group (string): eit...
Compute CTR for peak vs non-peak hours
You work on a video ads platform. You are given three tables and asked to compare CTR during peak hours vs non-peak hours. Tables Assume the following...
Compute reply-based user metrics in 7 days
You are analyzing discussions on a social platform. Tables all_post - post_id (BIGINT, PK) - post_author_id (BIGINT, FK → user.user_id) - post_creatio...
Write SQL for rankings, state, and aggregations
You are given several independent datasets. For each dataset, write the required SQL query (ANSI SQL is fine). Assume dates are in UTC and DATE column...
Retrieve First Active and Last Inactive Dates per User
Given a table activity that tracks user activities, write a SQL query to retrieve the first active date and last inactive date for each user. Table Sc...
Convert multi-currency revenue to USD totals
You are analyzing ad revenue recorded in multiple currencies and need to compute US revenue and global revenue in USD. Tables Assume the following sch...
Write SQL to compare social-only vs game-only engagement
You are given two tables capturing Oculus app usage. Define an 'active day' as a UTC date on which a user generates at least one event. Consider only ...
Find high-value crypto users and top CTR
You are given three tables. Assume all timestamps are stored in UTC. - users(user_id BIGINT PRIMARY KEY, create_date TIMESTAMP): one row per user acco...
Compute video-call SQL metrics with edge cases
Use 'today' = 2025-09-01. Assume UTC timestamps. Write SQL to answer both parts below and call out how your queries handle edge cases (duplicates, fai...
Calculate Pirated Usage and Revenue Loss
You are analyzing theme piracy on an e-commerce platform. Assume the analysis window is 2023-01-01 through 2023-12-31, all timestamps are stored in UT...
Compute multi-account user distribution and unread pct
You are working on a product where a user can have multiple accounts, and each account can receive notifications. Tables Assume the following schemas:...
Find high-value crypto users and top-CTR product
You are given three tables (timezone: UTC). Assume create_date, transaction_time, and event_time are timestamps. Tables users - user_id BIGINT PRIMARY...
Compute percent of active users with 50+ calls
Problem You work on a Messenger-like app. You want to measure how many active users in Great Britain (GB) today have been heavy callers recently. Tabl...
Calculate Cohort Retention
You are given two tables: users - user_id BIGINT PRIMARY KEY - signup_ts TIMESTAMP user_events - user_id BIGINT - event_ts TIMESTAMP - event_name VARC...