Customer Line-Items in the Last 7 Days :Track Customer Purchasing Intensity with a Rolling Seven-Day Count Intermediate
For each order detail, count the customer’s line items over a rolling seven-day window.
Xorthax wants to understand recent buying activity at the line-item level. For each order detail, show how many order details the same customer has placed in the last 7 calendar days (inclusive), ordered by the order’s timestamp.
Write Your Query
Monitoring customer purchase activity across a rolling seven-day period to reveal behavioral trends and short-term engagement patterns.
Applying grouping logic, chronological ordering, and time-based windowing techniques to measure customer activity within a defined period.
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.
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SQL Cookbook (O’Reilly)
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