How use class pagination with Join ?

[eluser]Gravedigger[/eluser]
Hi,
i have a question.
How to use class pagination with a sql join ?

Code:

$this->db->select('*');
$this->db->from('blogs');
$this->db->join('comments', 'comments.id = blogs.id');

$query = $this->db->get();

I can't bet in

Code:

get('blogs', $num, $offset)

Can you help me please