p.s. if you want to replicate the report attached above, but use a Command object so that you're filtering the group values instead of suppressing them (as a group selection filter suppress groups), then that syntax would be something like the following, using the xtreme (ms access) sample database...
SELECT *
FROM `Customer` `Customer`
WHERE `Customer`.`Country` IN
(
SELECT `Customer`.`Country`
FROM `Customer` `Customer`
GROUP BY `Customer`.`Country`
HAVING COUNT(`Customer`.`Customer ID`) = 1
ORDER BY `Customer`.`Country`
)