How many more people were in the second biggest racial group compared to the second smallest?
return racial groups ;return people of #1 ;return number of  #2 for each #1 ;return the  second  highest of #3 ;return the  second  lowest of #3 ;return the  difference of #4 and  #5
['select', 'project', 'group', 'aggregate', 'aggregate', 'arithmetic']