$sSQL .= " FROM us_postcode WHERE postcode NOT IN";
$sSQL .= " (SELECT postcode FROM location_postcode";
$sSQL .= " WHERE country_code = 'us')";
$sSQL .= " FROM us_postcode WHERE postcode NOT IN";
$sSQL .= " (SELECT postcode FROM location_postcode";
$sSQL .= " WHERE country_code = 'us')";