CREATE TABLE school_bus (school_id NUMBER, driver_id NUMBER, years_working NUMBER, if_full_time others)
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)

Show home city where at least two drivers older than 40 are from.
SELECT home_city FROM driver WHERE age > 40 GROUP BY home_city HAVING COUNT(*) >= 2
SELECT "home_city" FROM "driver" WHERE "age" > 40 GROUP BY "home_city" HAVING COUNT(*) >= 2