I’m excited to announce the successful completion of my SQL Business Analytics Challenge on Kaggle.
The challenge focused on a practical SQL problem:
Find the top-spending customer in each country over the last 30 days.
Participants were challenged to build a robust SQL solution using:
- JOIN operations between Customers and Orders
- Common Table Expressions (CTEs)
- Aggregation with SUM()
- Window functions such as ROW_NUMBER() or RANK()
- Country-level ranking
- Tie-breaking by customer name
- Filtering orders from the most recent 30 days
📊 Challenge Results
A total of 6 submissions were reviewed.
Submissions were evaluated based on:
- SQL logic correctness
- Proper use of window functions
- Query clarity and comments
- Explanation of the approach
- Overall correctness
🥇 SQL Excellence Award
Winner: Shohinur Pervez Shohan
Winning project:
“Top-Spending Customer Per Country”
The winning solution used a CTE + Window Function approach and was validated against the original dataset, including join cases and edge cases involving orders outside the 30-day window.
The solution correctly performed customer-level spending aggregation, ranked customers within each country, and handled the required tie-breaking logic.
👏 Congratulations to Shohinur Pervez Shohan!
🙌 Thank You to Everyone Who Participated
Thank you to everyone who submitted a SQL solution and took part in the challenge.
The goal of this challenge was not only competition, but also practical learning — applying SQL concepts to a realistic business analytics problem and comparing different approaches to solving it.
I’m happy to have organized this challenge and to see the community engage with SQL and data analytics.
🔗 Challenge & Results
You can view the full Kaggle challenge, submissions, and wrap-up here:
https://www.kaggle.com/competitions/sql-challenge-to-find-top-spending-customers-per-country-in/hackathon-host-wrap-up
More SQL, Data Analytics, AI, and programming challenges are coming soon. 🚀