This example illustrates use of keyword ALL in where clause.
This query returns events that will occur on venues with capacity lower than in venues 3 and 4.
select e1."Event_Name", v2."Capacity"
from "events" e1, "venues" v2
where (e1."VenueNo" = v2."VenueNo") and
(v2."Capacity" < all (select v."Capacity" from "venues" v where v."VenueNo" between 3 and 4))
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