What are the products out there?
select product from product
Tell me the page per minute color of these products.
select product, pages_per_minute_color from product
Which of these have a pages per minute color smaller than 5?
select product from product where pages_per_minute_color < 5
Which of these listed products also have a max page size "A4"?
select product from product where max_page_size = "A4" and pages_per_minute_color < 5