The check compares the column names too, where a task gives a name.

1. The value of the stock of each product (price times stock): name, then stock_value.
2. Each customer as one text value such as Ava Chen (CA): one column named label.
3. Each order line with its total (quantity times unit price): order_id, product_id, then line_total. Biggest total first; for equal totals, the lowest order_id first.
4. Think before you run it: what does SELECT 7 / 2 * 2; return? Chapter 1 showed what 7 / 2 gives.