/**
* Fetches the first column of the first row of the SQL result.
*
* @param string|EhrlichAndreas_Db_Select|Zend_Db_Select $sql
* An SQL SELECT statement.
* @param mixed $bind
* Data to bind into SELECT placeholders.
* @return string
*/
public function fetchOne($sql, $bind = array())
{
return $this->adapter->fetchOne($sql, $bind);
}