Q: Extract Month-Year from Order Date

SELECT DISTINCT TO_CHAR(order_date, 'YYYY-MM') AS month_year FROM orders ORDER BY month_year;... --- **🔒 Premium Content** This is a premium question with detailed explanations, step-by-step solutions, and additional insights. Upgrade to access the complete solution and advanced techniques. [Upgrade to Premium →](/premium)

Q: Group and Filter by HAVING

WITH FullTimeAvg AS ( SELECT d.name AS department_name, COUNT(e.id) AS emp_count, ROUND(AVG(e.salary), 2) AS avg_salary, STRING_AGG( e.name, ', ' ORDER BY e.salary DESC ... --- **🔒 Premium Content** This is a premium question with detailed explanations, step-by-step solutions, and additional insights. Upgrade to access the complete solution and advanced techniques. [Upgrade to Premium →](/premium)

Q: Identify Overlapping Project Durations

WITH overlapping_assignments AS ( SELECT a1.project_id, a1.project_name, a1.manager_id, a1.manager_name, a1.start_date, a1.end_date FROM project_assignments a1 INNER JOIN project_assig... --- **🔒 Premium Content** This is a premium question with detailed explanations, step-by-step solutions, and additional insights. Upgrade to access the complete solution and advanced techniques. [Upgrade to Premium →](/premium)

Q: Shopping Spree Streak

WITH daily_purchases AS ( SELECT DISTINCT user_id, purchase_date FROM purchases ), streaks AS ( SELECT user_id, purchase_date - ROW_NUMBER() OVER ( PARTITION BY user_id ORDER BY purchase_date )::INT AS date_group FROM daily_purchases ), spree_users AS ( SELECT user_id FROM streaks GROUP BY user_id, date_group HAVING COUNT(*) >= 3 ) SELECT DISTINCT user_id FROM spree_users ORDER BY user_id;

Question 1

Audit Shell Access and Activity

Accepted Answer

Learn how to audit system accounts for interactive shell access and last login activity using Linux Bash commands. This guide covers filtering /etc/passwd entries, identifying accounts with interactive shells, extracting last login information, and generating security reports, essential for compliance auditing, detecting dormant accounts, and enforcing the principle of least privilege.

Question 2

Verify Reverse DNS Records

Accepted Answer

Master reverse DNS (PTR) record validation and forward-reverse DNS consistency checks in Linux. Learn how to perform reverse DNS lookups on IP addresses to retrieve hostnames, verify forward DNS resolution for consistency, and diagnose mail server reputation issues. This guide covers identifying missing PTR records, detecting DNS misconfigurations, troubleshooting email rejection problems, and validating FCRDN (forward-confirmed reverse DNS) for proper mail server configuration. Essential for…

Question 3

Rate Limit Database Connections

Accepted Answer

Protect Linux services from connection floods and DDoS attacks using iptables rate limiting. Learn how to configure firewall rules to throttle incoming TCP connections (e.g., restricting port 9000 to 20 connections/second) using the limit or hashlimit modules. This guide covers setting up packet filtering to drop excessive connection attempts, testing firewall efficacy against connection storms, and implementing defense-in-depth strategies for database protection. Essential for preventing…

Question 4

Clean Up Feature Branch with Rebase

Accepted Answer

Comprehensively clean feature branches by rebasing onto main, reordering commits into logical sequence, and consolidating related changes. Use interactive rebase to reorganize documentation, bug fixes, and features into coherent groups, incorporate latest main changes, and prepare pull requests with clean history. Essential for feature completion, pull request quality, maintaining logical commit narratives, and preparing branches for team review.

Question 5

Generate RSA Key and Certificate Signing Request

Accepted Answer

Generate an RSA private key and create a Certificate Signing Request (CSR) with the correct Common Name for an internal HTTPS service.

Question 6

Top Products by Revenue

Accepted Answer

Rank products within each category by total revenue using window functions.

Question 7

Second Highest Salary

Accepted Answer

SELECT salary FROM employees WHERE salary < ( SELECT MAX(salary) FROM employees ) ORDER BY salary DESC LIMIT 1... --- **🔒 Premium Content** This is a premium question with detailed explanations, step-by-step solutions, and additional insights. Upgrade to access the complete solution and advanced techniques. [Upgrade to Premium →](/premium)

Question 8

Extract Month-Year from Order Date

Accepted Answer

SELECT DISTINCT TO_CHAR(order_date, 'YYYY-MM') AS month_year FROM orders ORDER BY month_year;... --- **🔒 Premium Content** This is a premium question with detailed explanations, step-by-step solutions, and additional insights. Upgrade to access the complete solution and advanced techniques. [Upgrade to Premium →](/premium)

Question 9

Group and Filter by HAVING

Accepted Answer

WITH FullTimeAvg AS ( SELECT d.name AS department_name, COUNT(e.id) AS emp_count, ROUND(AVG(e.salary), 2) AS avg_salary, STRING_AGG( e.name, ', ' ORDER BY e.salary DESC ... --- **🔒 Premium Content** This is a premium question with detailed explanations, step-by-step solutions, and additional insights. Upgrade to access the complete solution and advanced techniques. [Upgrade to Premium →](/premium)

Question 10

Identify Overlapping Project Durations

Accepted Answer

WITH overlapping_assignments AS ( SELECT a1.project_id, a1.project_name, a1.manager_id, a1.manager_name, a1.start_date, a1.end_date FROM project_assignments a1 INNER JOIN project_assig... --- **🔒 Premium Content** This is a premium question with detailed explanations, step-by-step solutions, and additional insights. Upgrade to access the complete solution and advanced techniques. [Upgrade to Premium →](/premium)

Question 11

Shopping Spree Streak

Accepted Answer

WITH
daily_purchases AS (
SELECT DISTINCT
user_id,
purchase_date
FROM
purchases
),
streaks AS (
SELECT
user_id,
purchase_date - ROW_NUMBER() OVER (
PARTITION BY
user_id
ORDER BY
purchase_date
)::INT AS date_group
FROM
daily_purchases
),
spree_users AS (
SELECT
user_id
FROM
streaks
GROUP BY
user_id,
date_group
HAVING
COUNT(*) >= 3
)
SELECT DISTINCT
user_id
FROM
spree_users
ORDER BY
user_id;

Question 12

Average Transaction Value by Store

Accepted Answer

SELECT stores.store_name, ROUND(AVG(transactions.total_amount), 2) AS avg_basket_size FROM stores JOIN transactions ON stores.store_id = transactions.store_id GROUP BY stores.store_name ORDER BY avg_basket_size DESC... --- **🔒 Premium Content** This is a premium question with detailed explanations, step-by-step solutions, and additional insights. Upgrade to access the complete solution and advanced techniques. [Upgrade to Premium →](/premium)

Walmart Interview Questions (12+ Questions)

Table of Contents

💡 Pro Tips for Walmart Interviews

Interview Questions & Answers

1. Audit Shell Access and Activity

2. Verify Reverse DNS Records

3. Rate Limit Database Connections

4. Clean Up Feature Branch with Rebase

5. Generate RSA Key and Certificate Signing Request

6. Top Products by Revenue

7. Second Highest Salary

Determining the Second Highest Unique Salary Using SQL

8. Extract Month-Year from Order Date

How to Retrieve Unique Months and Years from Order Dates Using SQL

Interview Question

9. Group and Filter by HAVING

Crafting the Perfect SQL Query for Identifying High-Salary Departments with Full-Time Employees

Objective

10. Identify Overlapping Project Durations

How to Solve Overlapping Project Assignments for the Same Manager Using SQL

11. Shopping Spree Streak

12. Average Transaction Value by Store

Objective

Additional Information

Ready to Practice More?