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So you are still using the propel - the blazing fast php orm but you want to narrow/scope your result by a complex/not daily condition?
No problem you can use a subquery and put it to the where condition area.

$mySubqueryForFoo = '(
    SELECT
        COUNT(*)
    FROM
        ' . FooPeer::TABLE_NAME . '
    WHERE
        ' . FooPeer::BAR_ID . ' = ' . BarPeer::ID . '
) > 0';

//if you are using the criteria object
$criteria->add(
    'my_subquery_for_foo',
    $mySubqueryForFoo,
    Criteria::CUSTOM
);

//if you are using the query object
BarQuerycreate()
->add(
    'my_subquery_for_foo',
    $mySubqueryForFoo,
    Criteria::CUSTOM
);