The Galactic Max Order Hunt :Identify Each Customer’s Maximum Order Value Sorted by Date Intermediate
Discover each customer's largest single order; sorted by time.
Xorthax is curious about the largest single order placed by each of his intergalactic customers. Write a query to calculate the maximum order amount for each customer, ordered by the order date.
Write Your Query
This reflects analyzing customer purchasing behavior to find the biggest individual transactions over time.
You will practice calculating maximum values within groups and presenting them alongside chronological order details.
This problem is labeled as Intermediate. It assumes you’ve written a few window function queries before, but you don’t need to be an expert. Use the hints and explanations if you get stuck — they’re there to help you think through the logic.
Yes. Every problem comes with optional hints you can reveal one at a time, plus a fully worked step-by-step solution. You decide how much help you want while practicing.
All problems on PracticeWindowFunctions.com are completely free and can be solved without creating an account. Right now there are over 80 practice problems, with new ones added regularly.
Ace the Data Science Interview
Comprehensive prep for data interviews: SQL, stats, product sense, and case studies.
(Affiliate link – as an Amazon Associate I earn from qualifying purchases.)