Routine~12min

The Orphan Payment

The gateway collected payment for 16 orders that don't exist in the orders table. Payment went through — money was charged — but the order creation step failed right after. ₹35,464 is stranded with no fulfilment record attached. Five other payments have no order_id at all: those are gift card top-ups, which legitimately have none.

Tables you'll query

orderspayments

What you'll learn

JOINsAggregations & GROUP BY
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