Keep Coding

I have two different tables as testimonial and pagetitles. While fetching the Pagetitles from database i need to compare first 4 characters if the both matches then i should get the data.
function getpagetitle($id)
{
$this->db->select('P.*,T.testimonial_name');
$this->db->from('pagetitle AS P');
$this->db->join('testimonials AS T','SUBSTR(T.testimonial_name, 4) = SUBSTR(P.page_title, 4)','INNER');
$this->db->where(array('P.page_title'=>$id));
$q=$this->db->get();
//var_dump($this->db->last_query());
//print_r($q->num_rows());
if($q->num_rows()>0)
{
$output = $q->result();
return $output[0];
}
else
{
return false;
}
}
Database tables
testimonials:
testimonial_id | testimonial_name |client_name
1 testimonial abc
2 testimonial def
Pagetitle
pagetitle_id | pagetitle
1 testimonial
2 career

i think you have to use if then statement in mysql ,
so if we want to change your query , it must be something like this :
select P.*,T.testimonial_name from pagetitle AS P , testimonials as T (
select IF 'SUBSTR(T.testimonial_name, 4) = SUBSTR(P.page_title, 4)'
where P.page_title>5
)
i dont test it , but i think it must be true