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

What is the average number of years spent working as a journalist?
SELECT AVG(years_working) FROM journalist
SELECT AVG("years_working") FROM "journalist"