SELECT Hometown FROM people WHERE Age  >  23 INTERSECT SELECT Hometown FROM people WHERE Age  <  20
From which hometowns did both people older than 23 and younger than 20 come from?
SELECT Hometown FROM people WHERE Age > 23 INTERSECT SELECT Hometown FROM people WHERE Age < 20
select hometown from people where age > value intersect select hometown from people where age < value
From which hometowns did both people older than 23 and younger than 20 come from ?