Recyclable And Low Fat Products Problem

1
2
3
4
5
6
7
8
9
10
+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| product_id  | int     |
| low_fats    | enum    |
| recyclable  | enum    |
+-------------+---------+
product_id is the primary key for this table.
low_fats is an ENUM of type ('Y', 'N') where 'Y' means this product is low fat and 'N' means it is not.
recyclable is an ENUM of types ('Y', 'N') where 'Y' means this product is recyclable and 'N' means it is not.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Products table:
+-------------+----------+------------+
| product_id  | low_fats | recyclable |
+-------------+----------+------------+
| 0           | Y        | N          |
| 1           | Y        | Y          |
| 2           | N        | Y          |
| 3           | Y        | Y          |
| 4           | N        | N          |
+-------------+----------+------------+
Result table:
+-------------+
| product_id  |
+-------------+
| 1           |
| 3           |
+-------------+
Only products 1 and 3 are both low fat and recyclable.

1
2
3
select product_id
from Products
where low_fats = "Y" and recyclable = "Y"