Data Manipulation (SQL/Python) Interview Questions
Practice 682 real Data Manipulation (SQL/Python) interview questions for 2026. Data Manipulation (SQL/Python) interview questions cover the core data work hiring teams use to judge day-one competence: translating product metrics into correct queries, handling edge cases (NULLs, late-arriving events, double-counting), writing efficient joins and window functions, and producing readable, reproducible Pandas code. Real interviews with detailed solutions in this category test both correctness and engineering judgment, not just syntax. Expect these questions across analytics and data-engineering loops at companies that weight practical querying heavily — especially Meta, Amazon, and TikTok. Interviewers evaluate problem scoping, test-case thinking, query performance, and clear communication of assumptions. For interview preparation, focus on hands-on practice: timed live SQL exercises, Pandas data-cleaning drills, and walking through tradeoffs when a naive query will be too slow. Practical habits that help in interviews include writing concise, well-commented queries, stating assumptions up front, and verifying results with small, explicit test cases.
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Create Monthly Revenue Report for Each Department
DEPARTMENT_REVENUE +------------+---------+-------+ | Department | Revenue | Month | +------------+---------+-------+ | A | 8000 | Jan |...
Calculate Response Rate and Compare User Survey Ratings
USERS user_id | signup_date 10 | 2024-03-20 11 | 2024-04-01 12 | 2024-04-05 SURVEYS survey_id | user_id | sent_at 1 | 10 ...
Identify Most Popular First-Watched Movie in Viewing History
MOVIE_VIEWS +------------+--------------------+------------+ | customer_id| title | date | +------------+--------------------+-----...
Calculate Cumulative Sum for Each Integer in Table
numbers +-----+ | num | +-----+ | 1 | | 2 | | 13 | | 14 | | 15 | +-----+ Scenario You have a table containing one integer per row; for each row...
Calculate Regional Revenue and Identify Top Customers
Customers | customer_id | name | region | |-------------|-------|--------| | 1 | Alice | East | | 2 | Bob | West | | 3 ...
Determine Old vs. New Users' Shop Visibility Changes
SHOP_VISIBILITY_HISTORY +----------+----------------+---------------------+-------------------+---------+ | user_id | user_signup_dt | action_timesta...
Analyze VR App Usage and Engagement Metrics
vr_usage +---------+------------+---------+------------+----------+ | user_id | date | app_id | session_id | duration | +---------+------------...
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...
Determine Product Buyer Count and Interaction Percentage
interactions +-----------+----------+------------+----+------------+ | seller_id | buyer_id | product_id | li | create_date| +-----------+----------+-...
Identify Top 10 Users by Average Call Duration
video_calls | call_id | user_id | start_time | end_time | |---------|---------|----------------------|----------------------| | ...
Understand SQL Aggregations and Joins: Key Differences Explained
Employees +----+--------+--------+---------+ | id | name | salary | dept_id | +----+--------+--------+---------+ | 1 | Alice | 70000 | 1 | ...
Analyze Group Call Adoption Using SQL Queries
CALL_LOGS | call_id | user_id | call_start | call_end | is_group_call | participant_cnt | | 101 | 12 | 2023-08-01 10:00...
Analyze and Clean European Ecommerce Sales Data
sales +----------+-------------+------------+---------+---------+----------------+ | order_id | customer_id | order_date | country | revenue | product...
Count Customers Buying Both 'Kindle' and 'Alexa'
ITEMS +---------+-----------+ | ITEM_ID | ITEM_NAME | +---------+-----------+ | 101 | Kindle | | 202 | Alexa | | 303 | Fire TV | ...
Identify Top Discounts and Monitor Code Submissions
Products +------------+----------+-------+----------+ | product_id | category | price | discount | +------------+----------+-------+----------+ | 101 ...
Count, Return, Find, and Select in SQL Queries
orders +----------+--------------+------------+--------+ | order_id | customer_id | order_date | amount | +----------+--------------+------------+---...
Calculate Total Interactions for Each Product
Interactions +----------+-----------+------------+--------------+ | buyer_id | seller_id | product_id | interactions | +----------+-----------+-------...
Identify Employees with Invalid Department References
EMPLOYEE +-----+-----+--------+ | eid | did | ename | +-----+-----+--------+ | 1 | 10 | Alice | | 2 | 11 | Bob | | 3 | 99 | Carol | +--...
Analyze Transaction Flow and User Engagement Efficiently
transactions +---------------+-------------+------------+--------+ | transaction_id| from_user_id| to_user_id | amount | +---------------+------------...
Generate Friendship List with Acceptance Dates Using Pandas
friend_events | requester_id | accepter_id | request_date | accept_date | |--------------|-------------|--------------|-------------| | 1 |...