# Task: 021

**Database:** retails  

## Question
Find customers with high purchase quantities.


## Gold Query

```sql
SELECT c.c_custkey, c.c_name, SUM(l.l_quantity) as total_quantity
FROM customer c
JOIN orders o ON c.c_custkey = o.o_custkey
JOIN lineitem l ON o.o_orderkey = l.l_orderkey
GROUP BY c.c_custkey, c.c_name
HAVING SUM(l.l_quantity) >= :quantity_threshold
ORDER BY total_quantity DESC;
```

**Execution Result:**

| c_custkey   | c_name             | total_quantity   |
|-------------|--------------------|------------------|
| 68513       | Customer#000068513 | 3779             |
| 114308      | Customer#000114308 | 3612             |
| 58421       | Customer#000058421 | 3605             |
| 147472      | Customer#000147472 | 3544             |
| 48853       | Customer#000048853 | 3535             |
| 25862       | Customer#000025862 | 3533             |
| 44167       | Customer#000044167 | 3526             |
| 84203       | Customer#000084203 | 3520             |
| 108451      | Customer#000108451 | 3486             |
| 12581       | Customer#000012581 | 3470             |
| ...         | ...                | ...              |
| 12931       | Customer#000012931 | 2802             |
| 17203       | Customer#000017203 | 2802             |
| 104228      | Customer#000104228 | 2802             |
| 10780       | Customer#000010780 | 2801             |
| 14912       | Customer#000014912 | 2801             |
| 78145       | Customer#000078145 | 2801             |
| 2648        | Customer#000002648 | 2800             |
| 22985       | Customer#000022985 | 2800             |
| 39151       | Customer#000039151 | 2800             |
| 102176      | Customer#000102176 | 2800             |

*... truncated (351 rows total)*