select "year_of_calendar","month_of_year","month_short_name","page_name","Unique_Visit_Count","PAGEVIEWCOUNT","TIMEONPAGE",page_view_count/unique_visit_count as average_page_views_per_visit,(timeonpage - coalesce(TIMEONPAGEBOUNCES))/(Unique_Visit_Count - coalesce(BOUNCES)) as average_time_spent_per_...