Return the id and full name of the customer with the most accounts.
return customers ;return accounts of  #1 ;return number of  #2 for each  #1 ;return #1 where #3 is  highest ;return id of  #4 ;return full name of  #4 ;return #5 ,  #6
['select', 'project', 'group', 'superlative', 'project', 'project', 'union']