How to execute my SQL query in CodeIgniter

Question

I have a problem with my query and I need to join two tables from different databases now my problem is how can I execute my query. I got my syntax format f

Answer 1

http://www.bsourcecode.com/codeigniter/codeigniter-select-query/

$query = $this->db->query("select * from tbl_user");

OR

$query = $this->db->select("*");
            $this->db->from('table_name');
            $query=$this->db->get();