Complex~35min

The Loyal Fraudster

Return rate jumped from a ~6% baseline to 23% overall. The highest-volume returners have perfect review scores and years of purchase history. They don't look like fraudsters. Look harder.

Tables you'll query

ordersreturnscustomersreviews

What you'll learn

Window FunctionsSubqueriesCTEs (WITH clause)JOINsAggregations & GROUP BY
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