Recyclable and Low Fat Products

Task: Find the ids of products that are both low fat and recyclable.

Table: Products

+-------------+------------+
| Column Name | Type       |
+-------------+------------+
| product_id  | INT        |
| low_fats    | varchar(1) |
| recyclable  | varchar(1) |
+-------------+------------+

Input: Products table:

+------------+----------+------------+
| product_id | low_fats | recyclable |
+------------+----------+------------+
| 1          | Y        | N          |
| 2          | Y        | Y          |
| 3          | N        | Y          |
| 4          | Y        | Y          |
| 5          | N        | N          |
+------------+----------+------------+

Output:

+------------+
| product_id |
+------------+
| 2          |
| 4          |
+------------+