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
[{'max(years_working)': 10, 'min(years_working)': 2, 'avg(years_working)': 5.8}]