public function fetchColumnAll($sql, array $params = array(), $pos = 0)
    {
        return $this->run($sql, $params)->fetchAll(PDO::FETCH_COLUMN, $pos);
    }
public function fetchColumnAll($sql, array $params = array(), $pos = 0)
    {
        return $this->run($sql, $params)->fetchAll(PDO::FETCH_COLUMN, $pos);
    }
public function fetchColumnAll ( $ sql , array $ params = array ( ) , $ pos = 0 ) { return $ this -> run ( $ sql , $ params ) -> fetchAll ( PDO :: FETCH_COLUMN , $ pos ) ; }
Returns a simple array of columns
@param string $sql
@param array $params
@param integer $pos
@return mixed
Returns a simple array of columns