How many more games did Pettitte start in 1992 than in 1993?
return Pettitte ;return games that #1 start ;return #2 in  1992 ;return #2 in  1993 ;return number of  #3 ;return number of  #4 ;return difference of #5 and  #6
['select', 'project', 'filter', 'filter', 'aggregate', 'aggregate', 'arithmetic']