D8LooPFocus modeCODE WORKSPACE
Detect upsert key violations
Return status and buyers (the count of distinct buyer_id values) for each status. Order by buyers descending, then status ascending.
GROUP BY status with COUNT(DISTINCT buyer_id) AS buyers, then ORDER BY buyers DESC, status ASC.
Sample input
ordersThe 6 paid orders belong to buyers 1, 3, 2, 3, 6, 2 — only 4 distinct buyers.
| order_id | buyer_id | status |
|---|---|---|
| 1001 | 1 | paid |
| 1002 | 3 | paid |
| 1005 | 2 | paid |
| 1007 | 3 | paid |
| 1010 | 6 | paid |
| 1011 | 2 | paid |
Expected output
Expected outputDistinct buyers per status, most first. paid has 6 orders but only 4 distinct buyers.
| status | buyers |
|---|---|
| paid | 4 |
| shipped | 3 |
| pending | 2 |
| refunded | 1 |
Constraints
GROUP BY status. Use COUNT(DISTINCT buyer_id) AS buyers so repeat buyers are counted once. Order by buyers DESC, status ASC.
Expected skills
Counting unique entities with COUNT(DISTINCT ...) inside groups.
SQL
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AI evaluation
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