php - In Codeigniter unable to use order_by random -


unable use order_by random in codeigniter

my code is:

function fetch_popular_news() {     $query=$this->db->order_by('id','rand')->limit(1)->get('main_slider');     $data=$query->result();     return $data; }

i tried:

function fetch_popular_news() {     $query=$this->db->order_by('id','random')->limit(1)->get('main_slider');     $data=$query->result();     return $data; }

but it's not working...

use instead, work:

order_by('rand()')

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