Active Record: fields from formula-Problem

[eluser]Ornis[/eluser]
I want to run the following mysql query:

SELECT
id,
CONCAT(number," ", species)
FROM
table

If I use active record:

$fields = "id, CONCAT(number,\" \", species)";
$this->db->select($fields);


I run into an error, because Codeignter inserts high-comma within the statement. Is their a workaround for this problem?

Thanks Martin