find the highest support percentage, lowest consider rate and oppose rate of all candidates.
return candidates ;return support percentages of  #1 ;return consider rates of  #1 ;return oppose rates of  #1 ;return the  highest #2 ;return the  lowest #3 ;return the  lowest #4 ;return #5 ,  #6 ,   #7
['select', 'project', 'project', 'project', 'aggregate', 'aggregate', 'aggregate', 'union']