Customer Line-Items in the Last 7 Days

Customer Line-Items in the Last 7 Days: Track Customer Purchasing Intensity with a Rolling Seven-Day Count

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.
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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. You don’t need to be an expert—just comfortable with SQL and willing to experiment. If you get stuck, the hints and solution will guide you step by step.

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