CREATE TABLE railway_manage (railway_id NUMBER, manager_id NUMBER, from_year CLOB)
CREATE TABLE train (train_id NUMBER, train_num CLOB, name CLOB, from CLOB, arrival CLOB, railway_id NUMBER)
CREATE TABLE railway (railway_id NUMBER, railway CLOB, builder CLOB, built CLOB, wheels CLOB, location CLOB, objectnumber CLOB)
CREATE TABLE manager (manager_id NUMBER, name CLOB, country CLOB, working_year_starts CLOB, age NUMBER, level NUMBER)

Show the countries that have both managers of age above 50 and managers of age below 46.
SELECT country FROM manager WHERE age > 50 INTERSECT SELECT country FROM manager WHERE age < 46
SELECT "country" FROM "manager" WHERE "age" > 50 INTERSECT SELECT "country" FROM "manager" WHERE "age" < 46