Write a query that will select from the table products
| product | price |
|---|---|
| Milk | 5 |
| Meat | 11 |
| Tomato | 10 |
| Candy | 3 |
| Onion | 1 |
product and product_category defined as follows:
- if the price is bigger than 10, product_category should be 'expensive'
- if the price is less than 3, product_category should be 'cheap'
- by default, product_category should be 'average'.