Order by Order, One by One

Order by Order, One by One :Identify Each Customer’s Chronological Order Sequence Intermediate

Assign a row number to each customer's orders based on the order date.

Xorthax wants to identify the sequence of orders placed by each customer based on the order date. Write a query to assign a row number to each order for every customer.
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This reflects tracking customer purchase history to understand the order sequence and frequency of their transactions.

You’ll work with sequencing data, ordering results by time, and organizing records within customer groups.

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.
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