SELECT Nationality FROM HOST WHERE Age  >  45 INTERSECT SELECT Nationality FROM HOST WHERE Age  <  35
Which nations have both hosts of age above 45 and hosts of age below 35?
SELECT Nationality FROM HOST WHERE Age > 45 INTERSECT SELECT Nationality FROM HOST WHERE Age < 35
select nationality from host where age > value intersect select nationality from host where age < value
Which nations have both hosts of age above 45 and hosts of age below 35 ?