select name, revenue from (
    select facs.name, sum(case 
                when memid = 0 then slots * facs.guestcost
                else slots * membercost
            end) as revenue
        from cd.bookings bks
        inner join cd.facilities facs
            on bks.facid = facs.facid
        group by facs.name
    ) as agg where revenue < 1000
order by revenue;