//<code>
$items = array();
 
$db = JFactory::getDbo();
$user = JFactory::getUser();
 
$items[] = "|Please Select[c]";
 
$db->setQuery("SELECT `FieldValue` FROM #__rsform_submission_values LEFT JOIN #__rsform_submissions ON #__rsform_submission_values.SubmissionId = #__rsform_submissions.SubmissionId WHERE #__rsform_submissions.`UserId`='". $user->get('id')."' AND #__rsform_submission_values.`FormId` = form_id_here AND #__rsform_submission_values.`FieldName` = 'field_name_here'");
$results = $db->loadObjectList();
 
foreach ($results as $result) {
 $value = $result->FieldValue;
 $items[] = $value;
 }
 
$items = implode("\n", $items);
 
return $items;
//</code>

//<code>
$items = array();
$db = JFactory::getDbo();
$items[] = "|Please Select[c]";
$db->setQuery("SELECT accountno, accountname FROM #__rsform_submission_values");
$results = $db->loadObjectList();
 
foreach ($results as $result) {
$value = $result->accountno;
$label = $result->accountname;
$items[] = $value.'|'.$label;
}
$items = implode ("\n", $items);
return $items;
//</code>

OK now my form running weel, this is the code:
 
SELECT `s`.`SubmissionId`,GROUP_CONCAT(IF(`sv`.`FieldName`='accountno', `sv`.`FieldValue`, NULL)) AS `accountno`,GROUP_CONCAT(IF(`sv`.`FieldName`='accountname', `sv`.`FieldValue`, NULL)) AS `accountname`
 FROM `yfeuk_rsform_submission_values` AS `sv`
 LEFT JOIN `yfeuk_rsform_submissions` AS `s`
 ON (`sv`.`SubmissionId`=`s`.`SubmissionId`)
 WHERE `s`.`FormId`='3'
 GROUP BY `s`.`SubmissionId`
 ORDER BY `SubmissionId` ASC
 
THANKS FOR YOR HELP COSMIN