# Task: 025

**Database:** retails  

## Question
For each manufacturer, find top N products with highest revenue from sales in America. Return the manufacturer, product, and revenue.


## Gold Query

```sql
WITH america_revenue AS (
SELECT
p.p_mfgr,
p.p_partkey,
p.p_name,
SUM(l.l_extendedprice) AS revenue,
RANK() OVER (PARTITION BY p.p_mfgr ORDER BY SUM(l.l_extendedprice) DESC) AS rn
FROM lineitem l
JOIN part p ON l.l_partkey = p.p_partkey
JOIN orders o ON l.l_orderkey = o.o_orderkey
JOIN customer c ON o.o_custkey = c.c_custkey
JOIN nation n ON c.c_nationkey = n.n_nationkey
WHERE n.n_name = 'UNITED STATES'
GROUP BY p.p_mfgr, p.p_partkey, p.p_name
)
SELECT p_mfgr, p_partkey, p_name, revenue
FROM america_revenue
WHERE rn <= :top_n
ORDER BY p_mfgr, revenue DESC;
```

**Execution Result:**

| p_mfgr         |   p_partkey | p_name                                  |   revenue |
|----------------|-------------|-----------------------------------------|-----------|
| Manufacturer#1 |      192229 | beige mint lavender light mint          | 350123.3  |
| Manufacturer#1 |       37637 | powder papaya azure blush gainsboro     | 341694.71 |
| Manufacturer#1 |      199745 | azure black firebrick green rosy        | 332053.2  |
| Manufacturer#2 |      108984 | linen chocolate sky misty linen         | 370694.28 |
| Manufacturer#2 |         896 | ivory thistle wheat lavender bisque     | 345002.88 |
| Manufacturer#2 |      178779 | pale peach cream orchid pale            | 334398.6  |
| Manufacturer#3 |       62925 | azure puff navy olive sky               | 402126.96 |
| Manufacturer#3 |      192905 | honeydew orchid dodger floral royal     | 385594.7  |
| Manufacturer#3 |      151855 | wheat goldenrod ghost floral brown      | 364208.35 |
| Manufacturer#4 |       76992 | slate medium powder antique goldenrod   | 354418.2  |
| Manufacturer#4 |      185839 | powder ghost sienna magenta wheat       | 338770.08 |
| Manufacturer#4 |      186960 | lemon blanched turquoise blush brown    | 335701.44 |
| Manufacturer#5 |       97943 | burnished lawn tomato magenta turquoise | 399833.64 |
| Manufacturer#5 |      150952 | slate tomato bisque linen orange        | 372548.7  |
| Manufacturer#5 |      169945 | antique thistle salmon steel indian     | 354629.44 |

*15 rows*