query: SELECT avg(age) ,  min(age) ,  CLASS FROM captain GROUP BY CLASS
question: What-all are the average and minimum age of different class captains?
query_toks: SELECT avg ( age ) , min ( age ) , CLASS FROM captain GROUP BY CLASS
query_toks_no_value: select avg ( age ) , min ( age ) , class from captain group by class
question_toks: What-all are the average and minimum age of different class captains?