Division Examples
Who would have lots to talk about with Bessie? "Find (all) customers who have rented (all) the same movies as Bessie has."
What airlines compete with Horizon Air? "Find the airlines which serve a city also served by Horizon" (not a division query).
Which airline is best positioned to put Horizon Air out of business? "Find the airlines which fly to (all) the cities served by Horizon" (a division query).