public function getDropSequenceSQL($xmldb_table, $xmldb_field, $include_trigger=false) {

        $result = array();

        if ($sequence_name = $this->getSequenceFromDB($xmldb_table)) {
            $result[] = "DROP SEQUENCE " . $sequence_name;
        }

        if ($trigger_name = $this->getTriggerFromDB($xmldb_table) && $include_trigger) {
            $result[] = "DROP TRIGGER " . $trigger_name;
        }

        return $result;
    }