What is the total number of hours per week and number of games played by students under 20?
return students ;return #1 that  are under 20 ;return hours per week of #2 ;return sum of #3 ;return games played of #2 ;return sum of #5 ;return #4 ,  #6
['select', 'filter', 'project', 'aggregate', 'project', 'aggregate', 'union']