CREATE TABLE church (church_id DECIMAL, name TEXT, organized_by TEXT, open_date DECIMAL, continuation_of TEXT)
CREATE TABLE people (people_id DECIMAL, name TEXT, country TEXT, is_male TEXT, age DECIMAL)
CREATE TABLE wedding (church_id DECIMAL, male_id DECIMAL, female_id DECIMAL, year DECIMAL)

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" < 25 INTERSECT SELECT "country" FROM "people" WHERE "age" > 30