Return the first names and last names of employees who earn more than 30000 in salary.
return employees ;return salaries of  #1 ;return #1 where  #2 is higher than 30000 ;return first names of  #3 ;return last names of  #3 ;return #4 ,  #5
['select', 'project', 'comparative', 'project', 'project', 'union']