SQL + Data Manipulation (SQL/Python) Interview Questions
Practice the exact questions companies are asking right now.
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Compute daily active ads
This question evaluates proficiency in data manipulation and analytics engineering, focusing on time-based event aggregation, status-based filtering, ...
Differentiate pandas objects and SQL filters
Python (pandas) 1. What is the difference between a pandas Series and a pandas DataFrame? - Discuss structure (1D vs 2D), indexing, column labels, ...
Determine Product Buyer Count and Interaction Percentage
interactions +-----------+----------+------------+----+------------+ | seller_id | buyer_id | product_id | li | create_date| +-----------+----------+-...
Calculate Weekly CTR and Campaign-Specific CTR in SQL
AdEvents ad_id | campaign_id | event | view_id | event_date 1 | 10 | impression | 123 | 2023-11-07 1 | 10 | cli...
Aggregate User Activity, Fit Regression, Interpret Coefficients
user_metrics +----------+------------+---------+--------+-----------+ | user_id | activity_dt| variant | clicks | purchases | +----------+-----------...
Calculate User Registration Date and 7-Day Retention Rate
user_posts +---------+--------------+-----------+ | user_id | posting_date | num_posts | +---------+--------------+-----------+ | 1 | 2023-01-01...
Analyze DoorDash Orders: High-Frequency Customers, Top Spenders, MoM Sales & Bottom-Percentile Reach
orders +-------------+-------------+---------------+---------------------+ | delivery_id | customer_id | restaurant_id | order_place_time | +------...
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...
Define and query shop visibility
You are given the following schema. Use only the columns provided; do not introduce new fields or labels. Tables and columns: - shops(shop_id INT, sho...
Assess SQL joins, unions, windows, dedup, and pandas
Using the schema and sample data below, answer all sub-questions. Unless stated, assume ANSI SQL and explain any dialect-specific choices. Schema: - c...
Write SQL to verify quarterly sales decline
You are given a single dataset for a beverage company and must decide whether Q2 2024 truly declined. Write one standard SQL query that produces a com...
Write SQL for profit, growth, retention
Write ANSI-SQL (PostgreSQL preferred) for the tasks below. Assume all timestamps are UTC and that "today" = 2025-09-01. Schema: - products(product_id ...
Write SQL/Python for ACH fraud analytics
As of today (2025-09-01), use the following schema and tiny samples to answer. Provide SQL for the SQL parts and Python for the Python part. Schema - ...
Compute CTR overall and by campaign type
Write SQL to compute: (Q1) overall click-through rate (CTR = clicks/impressions) in the last week; (Q2) CTR by campaign_type in the last week. Assume ...
Write SQL to analyze group-call concurrency
You are given call data and must compute group-call metrics. Schema (timestamps are UTC): Tables: - calls(call_id INT PRIMARY KEY, host_user_id INT, s...
Compute unconnected 60s posts and reactions averages
Given these tables and sample data, write SQL that answers both tasks below. Use today = 2025-09-01 and interpret "last/past 7 days" as the inclusive ...
Calculate survey response and quality metrics in SQL
Compute survey response-rate and quality metrics from event data. Assume "today" = 2025-09-01, and compute over the last 7 days (2025-08-26 to 2025-09...
Build SQL pivot with lookups and currency conversion
You are given the following schema and sample data. Use SQL (or Python with SQL-like transforms) to answer the tasks below. Treat amounts as gross rev...
Compute CTR and metrics with pandas
Using pandas only, compute banner and story metrics. Assume today is 2025-09-01 and 'last 7 days' means 2025-08-26 to 2025-09-01 inclusive. You are gi...
Match requests and accepts into friendships in SQL
Given two event tables, write a single SQL query (PostgreSQL) to output unique undirected friendships with the earliest valid friendship_date. Schema ...