How many more starts did Pettitte have with Columbus than with Albany-Colonie?
return Pettitte ;return Albany-Colonie ;return starts with Columbus of #1 ;return starts with Columbus of #2 ;return number of  #3 ;return number of  #4 ;return the  difference of #5 and  #6
['select', 'select', 'project', 'project', 'aggregate', 'aggregate', 'arithmetic']