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CODE WORKSPACE
Return country and paid_rate, the fraction of that country's orders whose status is paid, formatted to 2 decimal places as text with printf('%.2f', ...). Group by buyer country, replacing a missing country with 'unknown'. Order by the paid fraction descending, then country ascending.
Result columns · in this order
countrypaid_rateHow to approach it
Multiply by 1.0 to force decimals, then format: printf('%.2f', 1.0 * SUM(CASE WHEN o.status = 'paid' THEN 1 ELSE 0 END) / COUNT(*)).
Sample input
| order_id | buyer_id | status |
|---|---|---|
| 1001 | 1 | paid |
| 1004 | 1 | shipped |
| 1009 | 1 | pending |
| 1005 | 2 | paid |
| 1011 | 2 | paid |
5 rows — all rows shown.
| customer_id | country |
|---|---|
| 1 | US |
| 2 | null |
| 3 | GB |
| 4 | IN |
| 6 | GB |
5 rows — all rows shown.
Expected output
| country | paid_rate |
|---|---|
| unknown | 1.00 |
| GB | 0.60 |
| US | 0.33 |
| IN | 0.00 |
4 rows — all rows shown.
Constraints
JOIN orders to customers on customers.customer_id = orders.buyer_id. Force decimal math with 1.0 * SUM(CASE WHEN status = 'paid' THEN 1 ELSE 0 END) / COUNT(*) so it does not floor to 0, then wrap it in printf('%.2f', ...). Group by COALESCE(country, 'unknown'). Order by the numeric paid fraction DESC, then country ASC.
Expected skills
Safe ratio math (avoiding integer division), formatting a rate to fixed decimals, and grouping on a COALESCE expression.
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