What are the student ID and login name of the student who are enrolled in the most courses?
return students ;return courses #1 are  enrolled in ;return number of  #2 for each  #1 ;return #1 where #3 is  highest ;return student  ID of  #4 ;return login name of  #4 ;return #5 ,  #6
['select', 'project', 'group', 'superlative', 'project', 'project', 'union']