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CODE WORKSPACE
Return order_id, order_total, items_total, and diff for every order that has item rows.
Result columns · in this order
order_idorder_totalitems_totaldiffHow to approach it
Build item_totals first, then join back to orders.
Sample input
| order_id | order_total | example_item_rows |
|---|---|---|
| 1001 | 80 | SKU-A 80, SKU-B 30, SKU-C 120 |
| 1004 | 220 | SKU-A 80, SKU-D 60, SKU-E 80 |
2 rows — all rows shown.
Expected output
| order_id | order_total | items_total | diff |
|---|---|---|---|
| 1001 | 80 | 230 | -150 |
| 1002 | 120 | 140 | -20 |
| 1004 | 220 | 220 | 0 |
3 rows — all rows shown.
Constraints
Aggregate order_items to one row per order before joining to orders. diff is orders.total_amount - items_total. Order by order_id.
Expected skills
Fanout prevention, pre-aggregation, and reconciliation.
Submit for review to find out what your query gets right, what it gets wrong, and how it compares with the best working query for this exercise.
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