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

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