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This sample demonstrates use of subquery representing a separate field.
For each entry in table "Venues" the query counts quantity of events from table "Events" and places this number in a column named "EventsCount".
select v1."Venue",
(select count(*) from "Events" e1 where e1."VenueNo" = v1."VenueNo") as "EventsCount"
from "venues" v1
order by "EventsCount" desc
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