SELECT country FROM people WHERE age  <  25 INTERSECT SELECT country FROM people WHERE age  >  30
Show the country where people older than 30 and younger than 25 are from.
SELECT country FROM people WHERE age < 25 INTERSECT SELECT country FROM people WHERE age > 30
select country from people where age < value intersect select country from people where age > value
Show the country where people older than 30 and younger than 25 are from .