When did the staff member with first name as Janessa and last name as Sawayn leave the company?
return staff members ;return first names of #1 ;return #1 where #2 is  Janessa ;return last names of #1 ;return #1 where #4 is  Sawayn ;return #1 of both #3 and #5 ;return when  did  #6 leave the  company
['select', 'project', 'comparative', 'project', 'comparative', 'intersection', 'project']