Outstanding! Since you're doing so well, you should be ready for another operator. See the example:
WHERE area > ALL (
As you can see, we've got a new operator
ALL on the right side of the logical operator
>. In this case,
> ALL means "greater than every other value from the parentheses".
As a result, we'll get all the countries whose area is bigger than every other area of all cities. Liechtenstein, for instance, is a very small country. It is bigger than some cities (like Lyon, for example), but it is not bigger than every other city (Berlin is bigger, for example) so Liechtenstein won't be shown in the result.
You can also use
ALL with other logical operators: