What is the count and code of the job with the most employee?
return employees ;return jobs of #1 ;return number of  #1 for each #2 ;return the   highest of #3 ;return #2 where #3 is  #4 ;return the   code of #5 ;return #4 ,  #6
['select', 'project', 'group', 'aggregate', 'comparative', 'project', 'union']