How many years before William Y. Giles presented the league champion Astros with the Warren C. Giles Trophy did Williams father, Warren Giles, award an MLB franchise to the city of Houston?
return William Y. Giles presented the  league champion Astros with the   Warren C. Giles  Trophy ;return Williams father Warren Giles award an MLB franchise to the  city of Houston ;return when  was  #1 ;return when  was  #2 ;return difference of #3 and  #4 in  years
['select', 'select', 'project', 'project', 'arithmetic']