CREATE TABLE journalist (Nationality VARCHAR2, Years_working NUMBER)

Show the nations that have both journalists with more than 10 years of working and journalists with less than 3 years of working.
SELECT Nationality FROM journalist WHERE Years_working > 10 INTERSECT SELECT Nationality FROM journalist WHERE Years_working < 3
SELECT "Nationality" FROM "journalist" WHERE "Years_working" > 10 INTERSECT SELECT "Nationality" FROM "journalist" WHERE "Years_working" < 3