question: On what dates did the student with family name "Zieme" and personal name "Bernie" enroll in and complete the courses?
#1 return student 
#2 return family names of #1 
#3 return personal names of #1 
#4 return #1 where #2 is Zieme 
#5 return #4 where #3 is Bernie 
#6 return dates that #5 enroll in  courses 
#7 return dates that #5 complete the  courses 
#8 return #6 ,  #7