CREATE TABLE journalist (journalist_id NUMBER, name CLOB, nationality CLOB, age CLOB, years_working NUMBER)
CREATE TABLE news_report (journalist_id NUMBER, event_id NUMBER, work_type CLOB)
CREATE TABLE event (event_id NUMBER, date CLOB, venue CLOB, name CLOB, event_attendance NUMBER)

Show the most common nationality for journalists.
SELECT nationality FROM journalist GROUP BY nationality ORDER BY COUNT(*) DESC LIMIT 1
SELECT "nationality" FROM "journalist" GROUP BY "nationality" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY