Return the channel code and contact number of the customer contact channel whose active duration was the longest.
return customer contact channels ;return active durations of  #1 ;return #1 where  #2 is longest ;return channel codes of  #3 ;return contact number of  #3 ;return #4 ,  #5
['select', 'project', 'superlative', 'project', 'aggregate', 'union']