CREATE TABLE driver (driver_id NUMBER, name CLOB, party CLOB, home_city CLOB, age NUMBER)
CREATE TABLE school (school_id NUMBER, grade CLOB, school CLOB, location CLOB, type CLOB)
CREATE TABLE school_bus (school_id NUMBER, driver_id NUMBER, years_working NUMBER, if_full_time others)

What is the maximum, minimum and average years spent working on a school bus?
SELECT MAX(years_working), MIN(years_working), AVG(years_working) FROM school_bus
SELECT MAX("years_working"), MIN("years_working"), AVG("years_working") FROM "school_bus"