How many more years did Bob Barker emcee the Miss USA beauty pageant compared to Alan Thicke?
return Bob Barker emcee the  Miss USA beauty pageant ;return Alan Thicke emcee the  Miss USA beauty pageant ;return years of #1 ;return years of #2 ;return number of  #3 ;return number of  #4 ;return the  difference of #5 and  #6
['select', 'select', 'project', 'project', 'aggregate', 'aggregate', 'arithmetic']