Find the student ID and login name of the student with the most course enrollments
return students ;return course enrollments of  #1 ;return number of #2 ;return #1 where  #3 is  highest ;return student ID of  #4 ;return login name of  #4 ;return #5 ,   #6
['select', 'project', 'aggregate', 'superlative', 'project', 'project', 'union']